Fixed mypy 2.2.0 failures

 mypy 2.2.0 updated its typeshed definitions for argparse.ArgumentParser to align with recent updates to the standard library in newer Python versions (such as the addition of the file argument for output coloring and the
  optional formatter parameter).

  These new type stub signatures broke our overrides in cmd2/argparse_utils.py:
   - _get_formatter failed because the typeshed stub specifies it can accept an optional parameter file positionally, but our override only captured keyword arguments (**_kwargs: Any).
   - format_help failed because our override strictly took no arguments (def format_help(self)), while the base class accepts formatter.

Author: tleonhardt

cmd2/argparse_utils.py

@@ -1035,13 +1035,13 @@ def error(self, message: str) -> NoReturn:
 
         self.exit(2, f"{formatted_message}\n")
 
-    def _get_formatter(self, **_kwargs: Any) -> Cmd2HelpFormatter:
+    def _get_formatter(self, *_args: Any, **_kwargs: Any) -> Cmd2HelpFormatter:
         """Override with customizations for Cmd2HelpFormatter."""
         return self.formatter_class(prog=self.prog, file=self._thread_locals.current_output_file)
 
-    def format_help(self) -> str:
+    def format_help(self, *args: Any, **kwargs: Any) -> str:
         """Override to add a newline."""
-        return super().format_help() + "\n"
+        return super().format_help(*args, **kwargs) + "\n"
 
     def _get_nargs_pattern(self, action: argparse.Action) -> str:
         """Override to support nargs ranges."""