Add missing layout engine type hints

Author: QuLogic

lib/matplotlib/layout_engine.pyi

@@ -3,18 +3,18 @@ from matplotlib.figure import Figure
 from typing import Any
 
 class LayoutEngine:
-    def __init__(self, **kwargs) -> None: ...
+    def __init__(self, **kwargs: Any) -> None: ...
     def set(self) -> None: ...
     @property
     def colorbar_gridspec(self) -> bool: ...
     @property
     def adjust_compatible(self) -> bool: ...
     def get(self) -> dict[str, Any]: ...
-    def execute(self, fig) -> None: ...
+    def execute(self, fig: Figure) -> None: ...
 
 class PlaceHolderLayoutEngine(LayoutEngine):
     def __init__(
-        self, adjust_compatible: bool, colorbar_gridspec: bool, **kwargs
+        self, adjust_compatible: bool, colorbar_gridspec: bool, **kwargs: Any
     ) -> None: ...
     def execute(self, fig: Figure) -> None: ...
 
@@ -26,7 +26,7 @@ class TightLayoutEngine(LayoutEngine):
         h_pad: float | None = ...,
         w_pad: float | None = ...,
         rect: tuple[float, float, float, float] = ...,
-        **kwargs
+        **kwargs: Any
     ) -> None: ...
     def execute(self, fig: Figure) -> None: ...
     def set(
@@ -48,9 +48,9 @@ class ConstrainedLayoutEngine(LayoutEngine):
         wspace: float | None = ...,
         rect: tuple[float, float, float, float] = ...,
         compress: bool = ...,
-        **kwargs
+        **kwargs: Any
     ) -> None: ...
-    def execute(self, fig: Figure): ...
+    def execute(self, fig: Figure) -> Any: ...
     def set(
         self,
         *,