chore(deps-dev): bump hpack from 4.1.0 to 4.2.0

Bumps [hpack](https://github.com/python-hyper/hpack) from 4.1.0 to 4.2.0.
- [Changelog](https://github.com/python-hyper/hpack/blob/master/CHANGELOG.rst)
- [Commits](python-hyper/hpack@v4.1.0...v4.2.0)

---
updated-dependencies:
- dependency-name: hpack
  dependency-version: 4.2.0
  dependency-type: direct:development
...

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

Author: dependabot[bot]

requirements-dev.txt

@@ -136,7 +136,7 @@ h11==0.16.0 ; python_version >= '3.7'
 
 h2==4.3.0
 
-hpack==4.1.0 ; python_full_version >= '3.6.1'
+hpack==4.2.0 ; python_full_version >= '3.6.1'
 
 httpcore==1.0.9 ; python_version >= '3.7'