Bump @glint/tsserver-plugin from 2.0.9 to 2.1.0

Bumps [@glint/tsserver-plugin](https://github.com/typed-ember/glint) from 2.0.9 to 2.1.0.
- [Release notes](https://github.com/typed-ember/glint/releases)
- [Changelog](https://github.com/typed-ember/glint/blob/main/CHANGELOG.md)
- [Commits](https://github.com/typed-ember/glint/commits)

---
updated-dependencies:
- dependency-name: "@glint/tsserver-plugin"
  dependency-version: 2.1.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]