build(deps): bump httpx from 0.27.2 to 0.28.0

Bumps [httpx](https://github.com/encode/httpx) from 0.27.2 to 0.28.0.
- [Release notes](https://github.com/encode/httpx/releases)
- [Changelog](https://github.com/encode/httpx/blob/master/CHANGELOG.md)
- [Commits](encode/httpx@0.27.2...0.28.0)

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

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

requirements.txt

@@ -3,6 +3,6 @@ python-dotenv==1.0.1
 token_count==0.2.1
 loguru==0.7.2
 nicegui==2.1.0
-httpx==0.27.2
+httpx==0.28.0
 dynaconf==3.2.6
 toml==0.10.2