Update dependency python-multipart to v0.0.20

Author: renovate[bot]

requirements.txt

@@ -5,7 +5,7 @@ pydantic==2.6.1
 pydantic-settings==2.1.0
 python-jose[cryptography]==3.3.0
 passlib[bcrypt]==1.7.4
-python-multipart==0.0.9
+python-multipart==0.0.20
 asyncpg==0.29.0
 psycopg2-binary==2.9.9
 requests==2.31.0