Bump httpx from 0.28.0 to 0.28.1

Bumps [httpx](https://github.com/encode/httpx) from 0.28.0 to 0.28.1.
- [Release notes](https://github.com/encode/httpx/releases)
- [Changelog](https://github.com/encode/httpx/blob/master/CHANGELOG.md)
- [Commits](encode/httpx@0.28.0...0.28.1)

---
updated-dependencies:
- dependency-name: httpx
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements.txt

@@ -57,7 +57,7 @@ h11==0.14.0
     #   uvicorn
 httpcore==1.0.2
     # via httpx
-httpx==0.28.0
+httpx==0.28.1
     # via
     #   -r requirements.in
     #   datasette