chore(deps-dev): bump h2 from 4.2.0 to 4.3.0

Bumps [h2](https://github.com/python-hyper/h2) from 4.2.0 to 4.3.0.
- [Changelog](https://github.com/python-hyper/h2/blob/master/CHANGELOG.rst)
- [Commits](python-hyper/h2@v4.2.0...v4.3.0)

---
updated-dependencies:
- dependency-name: h2
  dependency-version: 4.3.0
  dependency-type: direct:development
...

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

Author: dependabot[bot]

requirements-dev.txt

@@ -135,7 +135,7 @@ frozenlist==1.7.0 ; python_version >= '3.7'
 
 h11==0.16.0 ; python_version >= '3.7'
 
-h2==4.2.0
+h2==4.3.0
 
 hpack==4.1.0 ; python_full_version >= '3.6.1'