Fix #355: Fix type error with lifespan context (#368)

Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com>

src/mcp/server/fastmcp/server.py

@@ -652,9 +652,9 @@ class Context(BaseModel, Generic[ServerSessionT, LifespanContextT]):
         Returns:
             The resource content as either text or bytes
         """
-        assert self._fastmcp is not None, (
-            "Context is not available outside of a request"
-        )
+        assert (
+            self._fastmcp is not None
+        ), "Context is not available outside of a request"
         return await self._fastmcp.read_resource(uri)
 
     async def log(