Release v0.21.3

What's Changed

• fix(patch): cherry-pick 9e6914d to release/v0.21.2-pr-15288 to patch version v0.21.2 and create version 0.21.3 by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/15295

Full Changelog: https://github.com/google-gemini/gemini-cli/compare/v0.21.2...v0.21.3