⬆ Update httpx requirement from <0.28.0,>=0.23.0 to >=0.23.0,<0.29.0

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](https://github.com/encode/httpx/compare/0.27.0...0.28.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements-docs-tests.txt

@@ -1,4 +1,4 @@
 # For mkdocstrings and tests
-httpx >=0.23.0,<0.28.0
+httpx >=0.23.0,<0.29.0
 # For linting and generating docs versions
 ruff ==0.6.4

requirements-github-actions.txt

@@ -1,6 +1,6 @@
 PyGithub>=2.3.0,<3.0.0
 pydantic>=2.5.3,<3.0.0
 pydantic-settings>=2.1.0,<3.0.0
-httpx>=0.27.0,<0.28.0
+httpx>=0.27.0,<0.29.0
 pyyaml >=5.3.1,<7.0.0
 smokeshow