style: apply ruff format to logger.debug call

Single-line the debug message as ruff format prefers.

Github-Issue: #2064

Author: herakles-dev

src/mcp/server/lowlevel/server.py

@@ -421,9 +421,7 @@ async def _handle_message(
                             logger="mcp.server.exception_handler",
                         )
                     except (anyio.ClosedResourceError, anyio.BrokenResourceError):
-                        logger.debug(
-                            "Could not send error log to client: write stream already closed"
-                        )
+                        logger.debug("Could not send error log to client: write stream already closed")
                     if raise_exceptions:
                         raise message
                 case _: