refactor: bump @babel/plugin-transform-flow-comments

Bumps [@babel/plugin-transform-flow-comments](https://github.com/babel/babel/tree/HEAD/packages/babel-plugin-transform-flow-comments) from 7.19.0 to 7.21.0.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.21.0/packages/babel-plugin-transform-flow-comments)

---
updated-dependencies:
- dependency-name: "@babel/plugin-transform-flow-comments"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]