chore: add release-please config for protobuf-4.x

[diegomarquezp]

go/cloud-java:protobuf-4.x-upgrade

Config in https://github.com/googleapis/java-spanner/blob/protobuf-4.x-rc/release-please-config.json

[gemini-code-assist]

Summary of Changes

Hello @diegomarquezp, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new release-please configuration to support the protobuf-4.x upgrade initiative. By configuring automated release management for the protobuf-4.x-rc branch, it ensures that the release process for this significant dependency update is streamlined and consistent.

Highlights

• Release Configuration: Added a new release-please configuration specifically for the protobuf-4.x-rc branch. This configuration enables automated release management for the java-yoshi release type, including minor version bumps before major releases, GitHub release handling, and manifest generation.

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[gemini-code-assist]

Code Review

This pull request adds a new configuration to .github/release-please.yml to support automated releases from the protobuf-4.x-rc branch. The configuration correctly enables a manifest-based release process, which is consistent with the project's release strategy for other branches like main. The change is straightforward and appears correct. I have no specific feedback as the implementation is sound.