Bump python-multipart from 0.0.7 to 0.0.20 in /backend

Bumps [python-multipart](https://github.com/Kludex/python-multipart) from 0.0.7 to 0.0.20.
- [Release notes](https://github.com/Kludex/python-multipart/releases)
- [Changelog](https://github.com/Kludex/python-multipart/blob/master/CHANGELOG.md)
- [Commits](Kludex/python-multipart@0.0.7...0.0.20)

---
updated-dependencies:
- dependency-name: python-multipart
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

backend/requirements-docker.txt

@@ -3,6 +3,6 @@ asyncpg==0.29.0
 fastapi==0.109.2
 httpx==0.26.0
 pydantic==2.6.1
-python-multipart==0.0.9
+python-multipart==0.0.20
 python-jose==3.3.0
 uvicorn==0.27.1

backend/src/requirements_docker.txt

@@ -3,7 +3,7 @@ fastapi==0.109.2
 httpx==0.26.0
 psycopg2-binary==2.9.9
 pydantic==2.5.3
-python-multipart==0.0.7
+python-multipart==0.0.20
 python-jose==3.3.0
 SQLAlchemy==2.0.24
 uvicorn==0.25.0