chore: cleanup release-please config #2727

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@diegomarquezp

The following contributors were found for this pull request:

✅ eb9420f Author: @diegomarquezp <die*******ezp@google.com>
✅ 92ba4a5 Author: @blakeli0 <bl****i@google.com>
✅ 35e78a8 Author: @cloud-java-bot <clou*******bot@google.com>

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