chore: Update googleapis/release-please-action digest to 16a9c90 (#470)

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

Author: renovate[bot]

.github/workflows/release-please.yaml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     name: Create new release PR
     steps:
-      - uses: googleapis/release-please-action@c2a5a2bd6a758a0937f1ddb1e8950609867ed15c # v4
+      - uses: googleapis/release-please-action@16a9c90856f42705d54a6fda1823352bdc62cf38 # v4
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           config-file: .github/actions/release-please/config.json