chore(deps-dev): bump httpx from 0.27.2 to 0.28.0

Bumps [httpx](https://github.com/encode/httpx) from 0.27.2 to 0.28.0.
- [Release notes](https://github.com/encode/httpx/releases)
- [Changelog](https://github.com/encode/httpx/blob/master/CHANGELOG.md)
- [Commits](encode/httpx@0.27.2...0.28.0)

---
updated-dependencies:
- dependency-name: httpx
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements-dev.txt

@@ -24,7 +24,7 @@ h11==0.14.0
 h2==4.1.0
 hpack==4.0.0
 httpcore==1.0.7
-httpx==0.27.2
+httpx==0.28.0
 hyperframe==6.0.1
 idna==3.10
 importlib-metadata==6.8.0