Bump actions/upload-artifact from 4 to 5

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 5.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...v5)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/pr-validation.yml

@@ -39,7 +39,7 @@ jobs:
       run: dotnet test --no-build -c Release --logger "trx;LogFileName=test-results.trx"
 
     - name: Upload test results
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v5
       if: always()
       with:
         name: test-results-${{ matrix.os }}