Merge pull request #7500 from open-webui/dependabot/pip/backend/dev/python-multipart-0.0.18

chore(deps): bump python-multipart from 0.0.17 to 0.0.18 in /backend

backend/requirements.txt

@@ -1,7 +1,7 @@
 fastapi==0.111.0
 uvicorn[standard]==0.30.6
 pydantic==2.9.2
-python-multipart==0.0.17
+python-multipart==0.0.18
 
 Flask==3.0.3
 Flask-Cors==5.0.0