chore(deps): bump build_runner from 2.1.11 to 2.2.1

Bumps [build_runner](https://github.com/dart-lang/build) from 2.1.11 to 2.2.1.
- [Release notes](https://github.com/dart-lang/build/releases)
- [Commits](https://github.com/dart-lang/build/compare/build_runner-v2.1.11...build_runner-v2.2.1)

---
updated-dependencies:
- dependency-name: build_runner
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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