chore(deps): update actions/upload-artifact action to v6 (#979)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/test.yml

@@ -179,7 +179,7 @@ jobs:
           done
 
       - name: Upload SBOM artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: SBOMs
           path: dotnet-*-root.sbom.spdx