Fix OpenGLMobject methods doctests

Author: giolucasd

manim/mobject/opengl/opengl_mobject.py

@@ -1908,15 +1908,16 @@ def stretch_to_fit_width(self, width: float, **kwargs) -> Self:
         ::
 
             >>> from manim import *
+            >>> import numpy as np
             >>> sq = Square()
             >>> sq.height
-            2.0
+            np.float64(2.0)
             >>> sq.stretch_to_fit_width(5)
             Square
             >>> sq.width
-            5.0
+            np.float64(5.0)
             >>> sq.height
-            2.0
+            np.float64(2.0)
         """
         return self.rescale_to_fit(width, 0, stretch=True, **kwargs)
 
@@ -1941,15 +1942,16 @@ def set_width(self, width: float, stretch: bool = False, **kwargs) -> Self:
         ::
 
             >>> from manim import *
+            >>> import numpy as np
             >>> sq = Square()
             >>> sq.height
-            2.0
+            np.float64(2.0)
             >>> sq.scale_to_fit_width(5)
             Square
             >>> sq.width
-            5.0
+            np.float64(5.0)
             >>> sq.height
-            5.0
+            np.float64(5.0)
         """
         return self.rescale_to_fit(width, 0, stretch=stretch, **kwargs)