chore(deps): Bump h2 from 0.3.21 to 0.4.3

Bumps [h2](https://github.com/hyperium/h2) from 0.3.21 to 0.4.3.
- [Release notes](https://github.com/hyperium/h2/releases)
- [Changelog](https://github.com/hyperium/h2/blob/master/CHANGELOG.md)
- [Commits](hyperium/h2@v0.3.21...v0.4.3)

---
updated-dependencies:
- dependency-name: h2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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