Bump tinacms from 1.6.3 to 2.1.0

Bumps [tinacms](https://github.com/tinacms/tinacms/tree/HEAD/packages/tinacms) from 1.6.3 to 2.1.0.
- [Release notes](https://github.com/tinacms/tinacms/releases)
- [Changelog](https://github.com/tinacms/tinacms/blob/main/packages/tinacms/CHANGELOG.md)
- [Commits](https://github.com/tinacms/tinacms/commits/HEAD/packages/tinacms)

---
updated-dependencies:
- dependency-name: tinacms
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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