test: skip deepwiki SSE MCP server test (#9218)

The deepwiki SSE MCP server is deprecated, so skip this test.

👾 Generated with [Letta Code](https://letta.com)

Co-authored-by: Letta <noreply@letta.com>

tests/mcp_tests/test_mcp.py

@@ -151,6 +151,7 @@ def agent_state(client):
     client.agents.delete(agent_state.id)
 
 
+@pytest.mark.skip(reason="The deepwiki SSE MCP server is deprecated")
 @pytest.mark.asyncio
 async def test_sse_mcp_server(client, agent_state):
     mcp_server_name = "deepwiki"