Bump httpx from 0.26.0 to 0.28.1

Bumps [httpx](https://github.com/encode/httpx) from 0.26.0 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@0.26.0...0.28.1)

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

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

pyproject.toml

@@ -30,7 +30,7 @@ dependencies = [
     "ratelimit==2.2.1",
     "sqlmodel==0.0.14",
     "typing_inspect==0.9.0",
-    "httpx==0.26.0",
+    "httpx==0.28.1",
     "sickle==0.7.0",
     "xmltodict==0.13.0",
     "python-multipart==0.0.19",