Keep the log-level gate helper out of connection.py __all__

Author: maxisbey

src/mcp/server/connection.py

@@ -50,7 +50,7 @@
 from mcp.shared.exceptions import MCPDeprecationWarning, NoBackChannelError
 from mcp.shared.peer import Meta, dump_params
 
-__all__ = ["Connection", "allowed_log_levels"]
+__all__ = ["Connection"]
 
 logger = logging.getLogger(__name__)
 # `Connection.log`'s `logger` parameter (public API, the spec's logger-name