Try to fix size function return type

Author: csd4ni3l

arcade/text.py

@@ -641,7 +641,7 @@ def height(self, value: int) -> None:
             raise RuntimeError("Text must be initialized before setting the height.")
 
     @property
-    def size(self) -> tuple[int, int] | None:
+    def size(self) -> tuple[int | None, int | None]:
         """Get the size of the label."""
         if self._initialized:
             return self._label.width, self._label.height