fix: bump python-multipart, pytest, pytest-asyncio to fix CVEs

- python-multipart 0.0.22 → 0.0.26 (CVE-2026-40347)
- pytest 8.3.3 → 9.0.3 (CVE-2025-71176)
- pytest-asyncio 0.24.0 → 0.26.0 (pytest 9 compat)

backend/requirements.txt

@@ -9,7 +9,7 @@ pydantic-settings==2.5.2
 python-jose[cryptography]==3.5.0
 passlib[bcrypt]==1.7.4
 bcrypt==4.0.1
-python-multipart==0.0.22
+python-multipart==0.0.26
 apscheduler==3.10.4
 python-nmap==0.7.1
 pyyaml==6.0.2
@@ -21,6 +21,6 @@ zeroconf==0.131.0
 # Dev
 ruff==0.6.9
 mypy==1.11.2
-pytest==8.3.3
-pytest-asyncio==0.24.0
+pytest==9.0.3
+pytest-asyncio==0.26.0
 pytest-cov==5.0.0