chore: pin googleapis/release-please-action action to 16a9c90 (#191)

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

Author: renovate[bot]

.github/workflows/release-please.yml

@@ -13,7 +13,7 @@ jobs:
             id-token: write
             models: read
         steps:
-            - uses: googleapis/release-please-action@v4
+            - uses: googleapis/release-please-action@16a9c90856f42705d54a6fda1823352bdc62cf38 # v4
               id: release
             - uses: actions/checkout@v6
               if: ${{ steps.release.outputs.release_created }}