Update actions/upload-pages-artifact action to v5

Author: renovate[bot]

.github/workflows/docs.yml

@@ -39,7 +39,7 @@ jobs:
     - run: dotnet tool restore
     - run: dotnet docfx docs/docfx.json
     - name: Upload artifact
-      uses: actions/upload-pages-artifact@v4
+      uses: actions/upload-pages-artifact@v5
       with:
         path: docs/_site
     - id: deployment