Pin mcp to versions <2 (#829)

1.0 is still in maintenance mode and will receive security fixes, see
https://github.com/modelcontextprotocol/python-sdk/releases/tag/v2.0.0

Fixes #826

Author: mateusz834

pyproject.toml

@@ -33,7 +33,7 @@ dependencies = []
 # Treat the same as NPM's `dependencies`
 [project.optional-dependencies]
 compat = ["six>=1.17.0"]
-ai = ["httpx==0.28.1", "langchain>=1.2.18", "mcp>=1.27.1", "pydantic>=2.13.4"]
+ai = ["httpx==0.28.1", "langchain>=1.2.18", "mcp>=1.27.1,<2", "pydantic>=2.13.4"]
 anthropic = ["splunk-sdk[ai]>=3.0.0", "langchain-anthropic>=1.4.3"]
 openai = ["splunk-sdk[ai]>=3.0.0", "langchain-openai>=1.2.1"]
 google = [