Bump Go to 1.26.3

[stuggi]

• Go: 1.24.4 -> 1.26.3
• operator-sdk: v1.41.1 -> v1.42.3
• golangci-lint: v2.4.0 -> v2.12.2
• GOTOOLCHAIN_VERSION: go1.24.0 -> go1.26.0
• go-toolset image: 1.24 -> 1.26
• .ci-operator.yaml: ci-build-root-golang-1.24-sdk-1.41.1 -> ci-build-root-golang-1.26-sdk-1.42.3
• ginkgo: v2.28.2 -> v2.32.0
• gomega: v1.42.0 -> v1.42.1

Code changes required by the bump:

• Replace fmt.Sprintf host:port patterns with net.JoinHostPort (Go 1.25+ hostport vet check) in memcached_controller.go, redis_controller.go, transporturl_controller.go, configmap.go, webhook_suite_test.go
• Fix gofmt formatting in apis/ (Go 1.26 import ordering and indentation)

Disabled govet inline analyzer in .golangci.yaml — Go 1.26 emits false-positive "cannot inline: type parameter inference not yet supported" for generic functions like maps.Copy and slices.Sorted.

Jira: OSPRH-30997

Depends-On: openstack-k8s-operators/openstack-operator#1977
Depends-On: openstack-k8s-operators/install_yamls#1153

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❌ openstack-k8s-operators-content-provider FAILURE in 10m 28s
⚠️ podified-multinode-edpm-deployment-crc SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider
⚠️ cifmw-crc-podified-edpm-baremetal SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider
✔️ cifmw-pod-zuul-files SUCCESS in 5m 00s

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/test infra-operator-build-deploy-kuttl

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❌ openstack-k8s-operators-content-provider FAILURE in 12m 32s
⚠️ podified-multinode-edpm-deployment-crc SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider
⚠️ cifmw-crc-podified-edpm-baremetal SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider
✔️ cifmw-pod-zuul-files SUCCESS in 6m 47s

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❌ openstack-k8s-operators-content-provider FAILURE in 11m 31s
⚠️ podified-multinode-edpm-deployment-crc SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider
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✔️ cifmw-pod-zuul-files SUCCESS in 4m 41s

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Test name	Commit	Details	Required	Rerun command
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recheck

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Build failed (check pipeline). Post recheck (without leading slash)
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✔️ openstack-k8s-operators-content-provider SUCCESS in 3h 28m 47s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 37m 04s
❌ cifmw-crc-podified-edpm-baremetal FAILURE in 49m 02s
✔️ cifmw-pod-zuul-files SUCCESS in 5m 20s