chore(deps): update litellm requirement (#2049)

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/v1.84.0)

---
updated-dependencies:
- dependency-name: litellm
  dependency-version: 1.84.0
  dependency-type: direct:production
...

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pyproject.toml

@@ -58,7 +58,7 @@ dependencies = [
     "protobuf>=6.33.5",
     "pdfminer-six>=20251230",
     "typer>=0.12.0",
-    "litellm>=1.83.7,<1.83.13",
+    "litellm>=1.83.7,<1.84.1",
     "python-multipart>=0.0.27",
     "tree-sitter>=0.23.0",
     "tree-sitter-python>=0.23.0",