Bump h2 from 4.1.0 to 4.3.0

Bumps [h2](https://github.com/python-hyper/h2) from 4.1.0 to 4.3.0.
- [Changelog](https://github.com/python-hyper/h2/blob/master/CHANGELOG.rst)
- [Commits](python-hyper/h2@v4.1.0...v4.3.0)

---
updated-dependencies:
- dependency-name: h2
  dependency-version: 4.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -10,7 +10,7 @@ django-webpack-loader==1.8.1
 djangorestframework==3.15.1
 google-api-python-client==2.183.0
 gunicorn==22.0.0
-h2==4.1.0
+h2==4.3.0
 kombu==5.3.7
 lameenc==1.7.0
 nnabla==1.30.0