Bump actions/checkout from 4.2.2 to 6.0.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.2.2 to 6.0.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4.2.2...v6.0.0)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/dotnetcore.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 30
     steps:
-      - uses: actions/checkout@v4.2.2
+      - uses: actions/checkout@v6.0.0
 
       - name: Build
         run: dotnet build /WarnAsError
@@ -25,7 +25,7 @@ jobs:
     timeout-minutes: 30
 
     steps:
-    - uses: actions/checkout@v4.2.2
+    - uses: actions/checkout@v6.0.0
 
     - name: Tests
       run: dotnet test --framework netcoreapp${{ matrix.framework }}

.github/workflows/release.yml

@@ -28,7 +28,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 30
     steps:
-      - uses: actions/checkout@v4.2.2
+      - uses: actions/checkout@v6.0.0
 
       # The tests should have already been run during the PR workflow, so this is really just a sanity check
       - name: Tests