Bump actions/upload-artifact from 5 to 6 (#72)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v5...v6)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/pr-validation.yml

@@ -98,7 +98,7 @@ jobs:
                   echo "Build completed successfully"
 
             - name: Upload build artifacts
-              uses: actions/upload-artifact@v5
+              uses: actions/upload-artifact@v6
               with:
                   name: build-artifacts
                   path: dist/