Fix trailing whitespace linting issues

Author: Nabeelshar

lib/matplotlib/tests/test_axes.py

@@ -6137,12 +6137,12 @@ def test_grid_color_with_alpha():
     """Test that grid(color=(..., alpha)) respects the alpha value."""
     fig, ax = plt.subplots()
     ax.grid(True, color=(0.5, 0.6, 0.7, 0.3))
-    
+
     # Check that alpha is extracted from color tuple
     for tick in ax.xaxis.get_major_ticks():
         assert tick.gridline.get_alpha() == 0.3, \
             f"Expected alpha=0.3, got {tick.gridline.get_alpha()}"
-        
+
     for tick in ax.yaxis.get_major_ticks():
         assert tick.gridline.get_alpha() == 0.3, \
             f"Expected alpha=0.3, got {tick.gridline.get_alpha()}"