Fix signature override of WorkflowModule.save_to_step() method

Fix the following mypy 1.11 errors:

```
lib/galaxy/workflow/modules.py:650: error: Signature of "save_to_step"
incompatible with supertype "WorkflowModule"  [override]
        def save_to_step(self, step, **kwd):
        ^
lib/galaxy/workflow/modules.py:650: note:      Superclass:
lib/galaxy/workflow/modules.py:650: note:          def save_to_step(self, step: Any, detached: Any = ...) -> Any
lib/galaxy/workflow/modules.py:650: note:      Subclass:
lib/galaxy/workflow/modules.py:650: note:          def save_to_step(self, step: Any, **kwd: Any) -> Any
lib/galaxy/workflow/modules.py:1030: error: Signature of "save_to_step"
incompatible with supertype "WorkflowModule"  [override]
        def save_to_step(self, step, **kwd):
        ^
lib/galaxy/workflow/modules.py:1030: note:      Superclass:
lib/galaxy/workflow/modules.py:1030: note:          def save_to_step(self, step: Any, detached: Any = ...) -> Any
lib/galaxy/workflow/modules.py:1030: note:      Subclass:
lib/galaxy/workflow/modules.py:1030: note:          def save_to_step(self, step: Any, **kwd: Any) -> Any
lib/galaxy/workflow/modules.py:1680: error: Signature of "save_to_step"
incompatible with supertype "WorkflowModule"  [override]
        def save_to_step(self, step, **kwd):
        ^
lib/galaxy/workflow/modules.py:1680: note:      Superclass:
lib/galaxy/workflow/modules.py:1680: note:          def save_to_step(self, step: Any, detached: Any = ...) -> Any
lib/galaxy/workflow/modules.py:1680: note:      Subclass:
lib/galaxy/workflow/modules.py:1680: note:          def save_to_step(self, step: Any, **kwd: Any) -> Any
```

lib/galaxy/workflow/modules.py

@@ -286,7 +286,7 @@ def from_workflow_step(Class, trans, step, **kwds):
 
     # ---- Saving in various forms ------------------------------------------
 
-    def save_to_step(self, step, detached=False):
+    def save_to_step(self, step, detached: bool = False) -> None:
         step.type = self.type
         step.tool_inputs = self.get_state()
 
@@ -647,7 +647,7 @@ def from_workflow_step(Class, trans, step, **kwds):
         module.subworkflow = step.subworkflow
         return module
 
-    def save_to_step(self, step, **kwd):
+    def save_to_step(self, step, detached=False):
         step.type = self.type
         step.subworkflow = self.subworkflow
         ensure_object_added_to_session(step, object_in_session=self.subworkflow)
@@ -1027,7 +1027,7 @@ def step_state_to_tool_state(self, state):
         state = json.dumps(state)
         return state
 
-    def save_to_step(self, step, **kwd):
+    def save_to_step(self, step, detached=False):
         step.type = self.type
         step.tool_inputs = self._parse_state_into_dict()
 
@@ -1677,7 +1677,7 @@ def _string_to_parameter_def_option(str_value):
             rval.update({"parameter_type": self.default_parameter_type, "optional": self.default_optional})
         return rval
 
-    def save_to_step(self, step, **kwd):
+    def save_to_step(self, step, detached=False):
         step.type = self.type
         step.tool_inputs = self._parse_state_into_dict()