security: Update critical dependencies to latest secure versions

- cryptography: 41.0.7 → 44.0.1 (security fix for OpenSSL vulnerabilities)
- aiohttp: 3.9.1 → 3.12.14 (multiple security fixes)
- python-multipart: 0.0.6 → 0.0.18 (security and stability fixes)

These updates address 15 security vulnerabilities identified by GitHub's
security alerts. All updates are backwards compatible and tested.

Consolidates security fixes from PRs #19, #24, #25.

Author: remyluslosius

requirements.txt

@@ -12,14 +12,14 @@ pydantic[email]==2.5.0
 pydantic-settings==2.1.0
 python-jose[cryptography]==3.3.0
 passlib[bcrypt]==1.7.4
-python-multipart==0.0.6
+python-multipart==0.0.18
 aiofiles==23.2.1
 aiosmtplib==3.0.1
-cryptography==41.0.7
+cryptography==44.0.1
 pyjwt==2.8.0
 argon2-cffi==23.1.0
 httpx==0.25.2
-aiohttp==3.9.1
+aiohttp==3.12.14
 lxml==4.9.3
 xmltodict==0.13.0
 python-magic==0.4.27