chore(main): release 2.56.3 (#3775)

🤖 I have created a release *beep* *boop*
---


<details><summary>2.56.3</summary>

##
[2.56.3](googleapis/sdk-platform-java@v2.56.2...v2.56.3)
(2025-05-02)


### Bug Fixes

* Only send mtlsEndpoint if it is non-null
([#3767](googleapis/sdk-platform-java#3767))
([7068cbe](googleapis/sdk-platform-java@7068cbe))
* subscribe Airlock Docker image definition to GRPC updates
([#3765](googleapis/sdk-platform-java#3765))
([3b8f9ca](googleapis/sdk-platform-java@3b8f9ca))


### Dependencies

* update dependency com.google.errorprone:error_prone_annotations to
v2.38.0
([#3773](googleapis/sdk-platform-java#3773))
([43ea661](googleapis/sdk-platform-java@43ea661))
* update gapic-showcase to 36.2
([#3771](googleapis/sdk-platform-java#3771))
([6808c9b](googleapis/sdk-platform-java@6808c9b))
* update google auth library dependencies to v1.34.0
([#3772](googleapis/sdk-platform-java#3772))
([8efcac5](googleapis/sdk-platform-java@8efcac5))
* Update maven-shared-utils to v3.2.1
([#3768](googleapis/sdk-platform-java#3768))
([47f7907](googleapis/sdk-platform-java@47f7907))
</details>

---
This PR was generated with [Release
Please](https://github.com/googleapis/release-please). See
[documentation](https://github.com/googleapis/release-please#release-please).

---------

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
Co-authored-by: Lawrence Qiu <lawrenceqiu@google.com>

Author: release-please[bot]

sdk-platform-java/.cloudbuild/graalvm/cloudbuild-test-a.yaml

@@ -14,7 +14,7 @@
 
 timeout: 7200s # 2 hours
 substitutions:
-  _SHARED_DEPENDENCIES_VERSION: '3.46.3-SNAPSHOT' # {x-version-update:google-cloud-shared-dependencies:current}
+  _SHARED_DEPENDENCIES_VERSION: '3.46.3' # {x-version-update:google-cloud-shared-dependencies:current}
   _JAVA_SHARED_CONFIG_VERSION: '1.15.4'
 options:
   machineType: 'E2_HIGHCPU_8'

sdk-platform-java/.cloudbuild/graalvm/cloudbuild-test-b.yaml

@@ -14,7 +14,7 @@
 
 timeout: 7200s # 2 hours
 substitutions:
-  _SHARED_DEPENDENCIES_VERSION: '3.46.3-SNAPSHOT' # {x-version-update:google-cloud-shared-dependencies:current}
+  _SHARED_DEPENDENCIES_VERSION: '3.46.3' # {x-version-update:google-cloud-shared-dependencies:current}
   _JAVA_SHARED_CONFIG_VERSION: '1.15.4'
 options:
   machineType: 'E2_HIGHCPU_8'

sdk-platform-java/.cloudbuild/graalvm/cloudbuild-test-c.yaml

@@ -14,7 +14,7 @@
 
 timeout: 7200s # 2 hours
 substitutions:
-  _SHARED_DEPENDENCIES_VERSION: '3.46.3-SNAPSHOT' # {x-version-update:google-cloud-shared-dependencies:current}
+  _SHARED_DEPENDENCIES_VERSION: '3.46.3' # {x-version-update:google-cloud-shared-dependencies:current}
   _JAVA_SHARED_CONFIG_VERSION: '1.15.4'
 options:
   machineType: 'E2_HIGHCPU_8'

sdk-platform-java/.cloudbuild/graalvm/cloudbuild.yaml

@@ -14,7 +14,7 @@
 
 timeout: 7200s # 2 hours
 substitutions:
-  _SHARED_DEPENDENCIES_VERSION: '3.46.3-SNAPSHOT' # {x-version-update:google-cloud-shared-dependencies:current}
+  _SHARED_DEPENDENCIES_VERSION: '3.46.3' # {x-version-update:google-cloud-shared-dependencies:current}
   _JAVA_SHARED_CONFIG_VERSION: '1.15.4'
 steps:
   # GraalVM A build

sdk-platform-java/.cloudbuild/library_generation/cloudbuild-library-generation-push.yaml

@@ -14,7 +14,7 @@
 
 timeout: 7200s # 2 hours
 substitutions:
-  _GAPIC_GENERATOR_JAVA_VERSION: '2.56.3-SNAPSHOT' # {x-version-update:gapic-generator-java:current}
+  _GAPIC_GENERATOR_JAVA_VERSION: '2.56.3' # {x-version-update:gapic-generator-java:current}
   _PRIVATE_IMAGE_NAME: "us-docker.pkg.dev/java-hermetic-build-prod/private-resources/java-library-generation"
   _PRIVATE_SHA_IMAGE_ID: "${_PRIVATE_IMAGE_NAME}:${COMMIT_SHA}"
   _PRIVATE_LATEST_IMAGE_ID: "${_PRIVATE_IMAGE_NAME}:latest"

sdk-platform-java/.cloudbuild/library_generation/library_generation.Dockerfile

@@ -21,7 +21,7 @@ FROM docker.io/library/maven:3.9.9-eclipse-temurin-17-alpine@sha256:969014ee8852
 WORKDIR /sdk-platform-java
 COPY . .
 # {x-version-update-start:gapic-generator-java:current}
-ENV DOCKER_GAPIC_GENERATOR_VERSION="2.56.3-SNAPSHOT"
+ENV DOCKER_GAPIC_GENERATOR_VERSION="2.56.3"
 # {x-version-update-end}
 
 # Download the java formatter

sdk-platform-java/.cloudbuild/library_generation/library_generation_airlock.Dockerfile

@@ -21,7 +21,7 @@ FROM us-docker.pkg.dev/artifact-foundry-prod/docker-3p-trusted/maven@sha256:d3f0
 WORKDIR /sdk-platform-java
 COPY . .
 # {x-version-update-start:gapic-generator-java:current}
-ENV DOCKER_GAPIC_GENERATOR_VERSION="2.56.3-SNAPSHOT"
+ENV DOCKER_GAPIC_GENERATOR_VERSION="2.56.3"
 # {x-version-update-end}
 
 # Download the java formatter

sdk-platform-java/.release-please-manifest.json

@@ -1,3 +1,3 @@
 {
-  ".": "2.56.2"
+  ".": "2.56.3"
 }

sdk-platform-java/CHANGELOG.md

@@ -1,5 +1,21 @@
 # Changelog
 
+## [2.56.3](https://github.com/googleapis/sdk-platform-java/compare/v2.56.2...v2.56.3) (2025-05-02)
+
+
+### Bug Fixes
+
+* Only send mtlsEndpoint if it is non-null ([#3767](https://github.com/googleapis/sdk-platform-java/issues/3767)) ([8f8df7b](https://github.com/googleapis/sdk-platform-java/commit/8f8df7b8eb00adfb49db09e95383a88bdb9eff9e))
+* subscribe Airlock Docker image definition to GRPC updates ([#3765](https://github.com/googleapis/sdk-platform-java/issues/3765)) ([d0f43e3](https://github.com/googleapis/sdk-platform-java/commit/d0f43e33951a7c9da0fe2adb122f7c73038e9421))
+
+
+### Dependencies
+
+* update dependency com.google.errorprone:error_prone_annotations to v2.38.0 ([#3773](https://github.com/googleapis/sdk-platform-java/issues/3773)) ([e16fe65](https://github.com/googleapis/sdk-platform-java/commit/e16fe65fed7dc704fce37dfe6957246407dc6178))
+* update gapic-showcase to 36.2 ([#3771](https://github.com/googleapis/sdk-platform-java/issues/3771)) ([15b2577](https://github.com/googleapis/sdk-platform-java/commit/15b2577f67a130d6dbef2ae93da53ab2b49211c7))
+* update google auth library dependencies to v1.34.0 ([#3772](https://github.com/googleapis/sdk-platform-java/issues/3772)) ([406a180](https://github.com/googleapis/sdk-platform-java/commit/406a180969f865d13bf0e880db10c1a65f0ba536))
+* Update maven-shared-utils to v3.2.1 ([#3768](https://github.com/googleapis/sdk-platform-java/issues/3768)) ([7ec93c3](https://github.com/googleapis/sdk-platform-java/commit/7ec93c3015284ecc0e18e820088ebea5aa6975ff))
+
 ## [2.56.2](https://github.com/googleapis/sdk-platform-java/compare/v2.56.1...v2.56.2) (2025-04-23)
 
 

sdk-platform-java/WORKSPACE

@@ -58,7 +58,7 @@ load("@rules_jvm_external//:defs.bzl", "maven_install")
 load("@io_grpc_grpc_java//:repositories.bzl", "IO_GRPC_GRPC_JAVA_ARTIFACTS")
 load("@io_grpc_grpc_java//:repositories.bzl", "IO_GRPC_GRPC_JAVA_OVERRIDE_TARGETS")
 
-_gapic_generator_java_version = "2.56.3-SNAPSHOT"  # {x-version-update:gapic-generator-java:current}
+_gapic_generator_java_version = "2.56.3"  # {x-version-update:gapic-generator-java:current}
 
 maven_install(
     artifacts = [