Bump actions/checkout from 2 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -38,7 +38,7 @@ jobs:
       GPR_PASSWORD: ${{ secrets.NUGET_GITHUB_TOKEN }}
     steps:
       - name: Checkout the repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Fetch all tags and branches
         run: git fetch --prune --unshallow