Update litellm requirement from 1.76.1 to 1.82.6

Updates the requirements on [litellm](https://github.com/BerriAI/litellm) to permit the latest version.
- [Release notes](https://github.com/BerriAI/litellm/releases)
- [Commits](https://github.com/BerriAI/litellm/commits)

---
updated-dependencies:
- dependency-name: litellm
  dependency-version: 1.82.6
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pyproject.toml

@@ -71,7 +71,7 @@ networkx = "*"
 aiofiles = "*"
 rich = "*"
 numpy = "*"
-litellm = "1.76.1"
+litellm = "1.82.6"
 httpx = "*"
 mcp = "*"
 aiohttp = "*"