Bump actions/checkout from 5 to 6

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] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci-build.yml

@@ -14,7 +14,7 @@ jobs:
     env:
       solution-path: './src/NetCore.Utilities.Spreadsheet.sln'
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0
 
@@ -55,7 +55,7 @@ jobs:
         uses: actions/setup-dotnet@v5
         with:
           dotnet-version: 9.0.x
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
       - name: Cache SonarCloud packages

.github/workflows/release-build.yml

@@ -13,7 +13,7 @@ jobs:
     env:
       solution-path: './src/NetCore.Utilities.Spreadsheet.sln'
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0