Bump actions/checkout from 5 to 6 (#238)

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -26,7 +26,7 @@ jobs:
             8.0.x
             9.0.x
             10.0.x
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Tool restore
         run: dotnet tool restore
       - name: Restore
@@ -49,7 +49,7 @@ jobs:
     env:
       DOTNET_CLI_TELEMETRY_OPTOUT: 'true'
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup .Net 10.0.x
         uses: actions/setup-dotnet@v5
         with:

.github/workflows/nightly-release.yml

@@ -18,7 +18,7 @@ jobs:
             8.0.x
             9.0.x
             10.0.x
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Fetch all history for all tags and branches
         run: git fetch --prune --unshallow
       - name: Tool restore

.github/workflows/pr-build.yml

@@ -27,7 +27,7 @@ jobs:
             8.0.x
             9.0.x
             10.0.x
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Tool restore
         run: dotnet tool restore
       - name: Restore
@@ -50,7 +50,7 @@ jobs:
     env:
       DOTNET_CLI_TELEMETRY_OPTOUT: 'true'
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup .Net 10.0.x
         uses: actions/setup-dotnet@v5
         with:

.github/workflows/release.yml

@@ -20,7 +20,7 @@ jobs:
             8.0.x
             9.0.x
             10.0.x
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Fetch all history for all tags and branches
         run: git fetch --prune --unshallow
       - run: |