Bump finality-grandpa from 0.16.1 to 0.16.2

Bumps [finality-grandpa](https://github.com/paritytech/finality-grandpa) from 0.16.1 to 0.16.2.
- [Release notes](https://github.com/paritytech/finality-grandpa/releases)
- [Commits](https://github.com/paritytech/finality-grandpa/compare/v0.16.1...v0.16.2)

---
updated-dependencies:
- dependency-name: finality-grandpa
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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