fix: requirements.txt to reduce vulnerabilities (#63)

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-URLLIB3-10390194
- https://snyk.io/vuln/SNYK-PYTHON-URLLIB3-14192442
- https://snyk.io/vuln/SNYK-PYTHON-URLLIB3-14192443
- https://snyk.io/vuln/SNYK-PYTHON-URLLIB3-14896210
- https://snyk.io/vuln/SNYK-PYTHON-URLLIB3-7267250

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

Author: ntindle

requirements.txt

@@ -16,7 +16,7 @@ httpx[http2]
 bcrypt==5.0.0
 python-dotenv==1.2.1
 requests==2.32.5
-urllib3>=2.6.0  # Security fix for CVE-2024-37891
+urllib3>=2.6.3  # Security fix for CVE-2024-37891
 pre-commit==4.5.1
 pydantic==2.12.5
 Flask-Talisman==1.1.0