⬆ Update httpx requirement from <0.25.0,>=0.23.0 to >=0.23.0,<0.28.0 (fastapi#11509)

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@0.23.0...0.27.0)

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

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

Author: dependabot[bot]

requirements-docs-tests.txt

@@ -1,4 +1,4 @@
 # For mkdocstrings and tests
-httpx >=0.23.0,<0.25.0
+httpx >=0.23.0,<0.28.0
 # For linting and generating docs versions
 ruff ==0.6.4