#33405 Upgrade gunicorn to 26 for proxy security fix
LiteLLM proxy currently allows `gunicorn>=23.0.0,<24.0` through the proxy extra
The Aikido advisory `AIKIDO-2026-10742` reports `gunicorn` versions `0.1` through `25.3.0` as affected by HTTP request smuggling and related HTTP framing issues, with `26.0.0` as the fixed release
The proxy dependency should move to `gunicorn>=26.0.0,<27.0`, and the lockfile should resolve `gunicorn==26.0.0`, so proxy installs no longer resolve a vulnerable `gunicorn` release
https://intel.aikido.dev/cve/AIKIDO-2026-10742