build(deps): bump litellm

Bumps the pip group with 1 update in the /AIGateway directory: [litellm](https://github.com/BerriAI/litellm).


Updates `litellm` from 1.82.2 to 1.83.0
- [Release notes](https://github.com/BerriAI/litellm/releases)
- [Commits](https://github.com/BerriAI/litellm/commits)

---
updated-dependencies:
- dependency-name: litellm
  dependency-version: 1.83.0
  dependency-type: direct:production
  dependency-group: pip
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

AIGateway/requirements.txt

@@ -14,7 +14,7 @@ asyncpg>=0.30.0
 
 # LiteLLM SDK (MIT licensed)
 # Pinned to a specific version — updated per VerifyWise release
-litellm==1.82.2
+litellm==1.83.0
 
 # Database migrations (Alembic)
 sqlalchemy[asyncio]>=2.0.0