Bump httpx from 0.27.2 to 0.28.1 (#539)

Bumps [httpx](https://github.com/encode/httpx) from 0.27.2 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@0.27.2...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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pyproject.toml

@@ -28,7 +28,7 @@ dependencies    = [
 
 [project.optional-dependencies]
 requirements = [
-    "httpx==0.27.2",
+    "httpx==0.28.1",
     "orjson==3.10.12",
     "packaging==24.2",
     "xmltodict==0.14.2",