Move uvicorn import to usage (#502)

src/mcp/server/fastmcp/server.py

@@ -15,7 +15,6 @@ from typing import Any, Generic, Literal
 
 import anyio
 import pydantic_core
-import uvicorn
 from pydantic import BaseModel, Field
 from pydantic.networks import AnyUrl
 from pydantic_settings import BaseSettings, SettingsConfigDict
@@ -466,6 +465,7 @@ class FastMCP:
 
     async def run_sse_async(self) -> None:
         """Run the server using SSE transport."""
+        import uvicorn
         starlette_app = self.sse_app()
 
         config = uvicorn.Config(