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
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements-dev.txt

@@ -21,7 +21,7 @@ flit==3.12.0
 flit_core==3.12.0
 frozenlist==1.7.0
 h11==0.16.0
-h2==4.2.0
+h2==4.3.0
 hpack==4.1.0
 httpcore==1.0.9
 httpx==0.28.1