TYP: Fix type of Glyph.bbox

It is in fact a read-only property, not a method.

Author: QuLogic

lib/matplotlib/ft2font.pyi

@@ -249,4 +249,5 @@ class Glyph:
     vertBearingY: int
     vertAdvance: int
 
+    @property
     def bbox(self) -> tuple[int, int, int, int]: ...