fix(ci): use correct release-please-action domain after organization url was changed

[sebmellen]

Checklist

• [X] commit message follows commit guidelines

Description of change

The release-please action URL was recently changed from https://github.com/google-github-actions/release-please-action to https://github.com/googleapis/release-please-action (see https://github.com/googleapis/release-please-action/issues/980). This fixes the release-please action.