ci: Bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -97,7 +97,7 @@ jobs:
     name: Rust Format
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@stable
         with:
           components: rustfmt
@@ -107,7 +107,7 @@ jobs:
     name: Rust Clippy
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Install Linux dependencies
         run: |
           sudo apt-get update
@@ -122,7 +122,7 @@ jobs:
     name: Rust Test
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Install Linux dependencies
         run: |
           sudo apt-get update
@@ -135,7 +135,7 @@ jobs:
     name: Cargo Deny
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Install Linux dependencies
         run: |
           sudo apt-get update
@@ -150,7 +150,7 @@ jobs:
     name: Unused Dependencies
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Install Linux dependencies
         run: |
           sudo apt-get update
@@ -165,7 +165,7 @@ jobs:
     env:
       RUSTDOCFLAGS: '-D warnings'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Install Linux dependencies
         run: |
           sudo apt-get update
@@ -178,7 +178,7 @@ jobs:
     name: MSRV Check (1.85)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Install Linux dependencies
         run: |
           sudo apt-get update

.github/workflows/tauri-build.yml

@@ -23,7 +23,7 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-node@v6
         with: