build(deps-dev): update httpx requirement from ^0.27.0 to ^0.28.0 (#182)

Updates the requirements on [httpx](https://github.com/encode/httpx) to permit the latest version.
- [Release notes](https://github.com/encode/httpx/releases)
- [Changelog](https://github.com/encode/httpx/blob/master/CHANGELOG.md)
- [Commits](encode/httpx@0.27.0...0.28.0)

---
updated-dependencies:
- dependency-name: httpx
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pyproject.toml

@@ -25,7 +25,7 @@ requests = "^2.28.1"
 requests-html = "^0.10.0"
 pytest-asyncio = "^0.24.0"
 types-requests = "^2.28.11"
-httpx = "^0.27.0"
+httpx = "^0.28.0"
 
 [build-system]
 requires = [