chore(deps): bump python-multipart in /frontend/backend

Bumps [python-multipart](https://github.com/Kludex/python-multipart) from 0.0.20 to 0.0.26.
- [Release notes](https://github.com/Kludex/python-multipart/releases)
- [Changelog](https://github.com/Kludex/python-multipart/blob/master/CHANGELOG.md)
- [Commits](Kludex/python-multipart@0.0.20...0.0.26)

---
updated-dependencies:
- dependency-name: python-multipart
  dependency-version: 0.0.26
  dependency-type: direct:production
...

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

Author: dependabot[bot]

frontend/backend/requirements.txt

@@ -4,7 +4,7 @@ uvicorn==0.23.2
 websockets>=15.0
 python-dotenv==1.0.0
 httpx==0.25.0
-python-multipart==0.0.20
+python-multipart==0.0.26
 
 # NOTE: The main prompt-ops package should be installed in editable mode from the repo root:
 #   cd /path/to/prompt-ops && pip install -e .