MNT: Ignore matplotlib PendingDeprecationWarnings

Matplotlib 3.11 apparently decided that set_over()/set_under() will
eventually be deprecated. We can't begin to use the new functions yet,
so just suppress these warnings until 3.11 becomes our min version.

Author: dopplershift

pyproject.toml

@@ -111,6 +111,9 @@ xfail_strict = true
 filterwarnings = [
     "error",
     "ignore:numpy.ndarray size changed:RuntimeWarning",
+    # Nothing to be done now, need to wait until Matplotlib actually deprecates/removes
+    "ignore:.*set_over.*:PendingDeprecationWarning",
+    "ignore:.*set_under.*:PendingDeprecationWarning",
     # Numpy deprecation triggered by Pint: https://github.com/hgrecco/pint/pull/1880
     "ignore:Conversion of an array with ndim > 0 to a scalar is deprecated:DeprecationWarning:pint.facets.plain.quantity:575",
     # PyProj automatically dispatching for single point, will be waiting for NumPy 2.0 to address