deps(deps): bump httpx from 0.25.2 to 0.28.1

Bumps [httpx](https://github.com/encode/httpx) from 0.25.2 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@0.25.2...0.28.1)

---
updated-dependencies:
- dependency-name: httpx
  dependency-version: 0.28.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements.txt

@@ -26,7 +26,7 @@ python-dateutil==2.8.2
 # Development & Testing
 pytest==7.4.3
 pytest-asyncio==0.21.1
-httpx==0.25.2
+httpx==0.28.1
 
 # Frontend
 streamlit==1.28.2