Merge pull request matplotlib#30023 from QuLogic/fix-lint

Remove unused `_api` import

Author: timhoffm

lib/mpl_toolkits/axisartist/grid_helper_curvelinear.py

@@ -7,7 +7,6 @@
 import numpy as np
 
 import matplotlib as mpl
-from matplotlib import _api
 from matplotlib.path import Path
 from matplotlib.transforms import Affine2D, Bbox, IdentityTransform
 from .axislines import (