fix: requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-STARLETTE-13733964

Author: snyk-bot

requirements.txt

@@ -66,7 +66,7 @@ rpds-py==0.10.3
     #   referencing
 sniffio==1.3.0
     # via anyio
-starlette==0.27.0
+starlette==0.49.1
     # via fastapi
 swoop-db==8.0.3
     # via swoop (pyproject.toml)