Fix typing

src/click/core.py

@@ -1026,14 +1026,14 @@ def get_help_option(self, ctx: Context) -> Option | None:
         # Avoid circular import.
         from .decorators import help_option
 
-        def dummy_func():
+        def dummy_func() -> None:
             pass
 
         # Call @help_option decorator to produce an help option with proper
         # defaults and attach it to the dummy function defined above.
         help_option(*help_option_names)(dummy_func)
 
-        return dummy_func.__click_params__.pop()
+        return dummy_func.__click_params__.pop()  # type: ignore[no-any-return, attr-defined]
 
     def make_parser(self, ctx: Context) -> _OptionParser:
         """Creates the underlying option parser for this command."""