fix: requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-PYTHONMULTIPART-6227505

requirements.txt

@@ -14,7 +14,7 @@ responses==0.23.1
 pandas==1.5.2
 mongoengine==0.23.1
 passlib[bcrypt]==1.7.4
-python-multipart==0.0.5
+python-multipart==0.0.7
 py3dns==3.2.1
 black==21.12b0
 uvicorn>=0.18.2