Fix linting errors

src/arcaflow_plugin_sdk/atp.py

@@ -267,7 +267,6 @@ def send_runtime_message(self, message_type: MessageType, data: any):
             }
         )
 
-
     def read_results(self) -> (str, any, str):
         """
         This function reads the signals and results of an execution from the plugin.

src/arcaflow_plugin_sdk/plugin.py

@@ -53,8 +53,8 @@ def signal_decorator(func: _step_decorator_param) -> schema.SignalHandlerType:
         sig = inspect.signature(func)
         if len(sig.parameters) != 2:
             raise BadArgumentException(
-                "The '%s' (id: %s) signal must have exactly two parameters, including self. Currently has %v" %
-                (name, id, sig.parameters)
+                "The '%s' (id: %s) signal must have exactly two parameters, including self. Currently has %s" %
+                (name, id, str(sig.parameters))
             )
         input_param = list(sig.parameters.values())[1]
         if input_param.annotation is inspect.Parameter.empty:

src/arcaflow_plugin_sdk/test_atp.py

@@ -6,7 +6,7 @@
 from threading import Event
 from typing import TextIO, Tuple, Union, List
 
-from arcaflow_plugin_sdk import atp, plugin, schema, predefined_schemas
+from arcaflow_plugin_sdk import atp, plugin, schema
 
 
 @dataclasses.dataclass