Clean unused imports in .pyi files

src/Mod/Material/App/Material.pyi

@@ -4,7 +4,7 @@ from __future__ import annotations
 
 from Base.Metadata import export, no_args, sequence_protocol
 from Base.BaseClass import BaseClass
-from typing import Final, Dict
+from typing import Final
 
 @export(
     Include="Mod/Material/App/Materials.h",

src/Mod/Material/App/MaterialFilter.pyi

@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from Base.Metadata import export, constmethod
+from Base.Metadata import export
 from Base.BaseClass import BaseClass
 from typing import List
 

src/Mod/Material/App/MaterialLibrary.pyi

@@ -2,9 +2,8 @@
 
 from __future__ import annotations
 
-from Base.Metadata import export, constmethod
+from Base.Metadata import export
 from Base.BaseClass import BaseClass
-from typing import Final
 
 @export(
     Include="Mod/Material/App/MaterialLibrary.h",

src/Mod/Material/App/MaterialManager.pyi

@@ -2,9 +2,9 @@
 
 from __future__ import annotations
 
-from Base.Metadata import export, constmethod
+from Base.Metadata import export
 from Base.BaseClass import BaseClass
-from typing import Final, List, Dict, overload
+from typing import Final, List, Dict
 
 @export(Include="Mod/Material/App/MaterialManager.h", Namespace="Materials", Constructor=True)
 class MaterialManager(BaseClass):

src/Mod/Material/App/Model.pyi

@@ -2,9 +2,9 @@
 
 from __future__ import annotations
 
-from Base.Metadata import export, constmethod
+from Base.Metadata import export
 from Base.BaseClass import BaseClass
-from typing import Final, List, Dict, overload
+from typing import Final, List, Dict
 
 @export(
     Include="Mod/Material/App/Model.h",

src/Mod/Material/App/ModelManager.pyi

@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from Base.Metadata import export, constmethod
+from Base.Metadata import export
 from Base.BaseClass import BaseClass
 from typing import Final, List, Dict
 

src/Mod/Material/App/ModelProperty.pyi

@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from Base.Metadata import export, constmethod
+from Base.Metadata import export
 from Base.BaseClass import BaseClass
 from typing import Final
 

src/Mod/Material/App/UUIDs.pyi

@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from Base.Metadata import export, constmethod
+from Base.Metadata import export
 from Base.BaseClass import BaseClass
 from typing import Final
 

src/Mod/Material/Gui/MaterialTreeWidget.pyi

@@ -4,13 +4,8 @@ from __future__ import annotations
 
 from Metadata import (
     export,
-    constmethod,
-    forward_declarations,
-    class_declarations,
-    sequence_protocol,
 )
 from Base.BaseClass import BaseClass
-from typing import Final, overload
 
 @export(
     Twin="MaterialTreeWidget",