fix: CRITICAL: Hard pin litellm<=1.82.6 to mitigate supply chain attack (#1961)

Author: udaymehta

pyproject.toml

@@ -46,7 +46,7 @@ dependencies = [
 [project.optional-dependencies]
 anthropic = ["anthropic>=0.21.0,<1.0.0"]
 gemini = ["google-genai>=1.32.0,<2.0.0"]
-litellm = ["litellm>=1.75.9,<2.0.0", "openai>=1.68.0,<3.0.0"]
+litellm = ["litellm>=1.75.9,<=1.82.6", "openai>=1.68.0,<3.0.0"]
 llamaapi = ["llama-api-client>=0.1.0,<1.0.0"]
 mistral = ["mistralai>=1.8.2,<2.0.0"]
 ollama = ["ollama>=0.4.8,<1.0.0"]