COMPAT: Adjust CFTimeIndex.get_loc for pandas 2.0 deprecation enforcement (#7361)

* COMPAT: Adjust CFTimeIndex.get_loc for pandas 2.0 deprecation enforcement

* user super

* Add whatsnew and change to breaking change

Author: mroeschke

doc/whats-new.rst

@@ -27,6 +27,9 @@ New Features
 Breaking changes
 ~~~~~~~~~~~~~~~~
 
+- :py:meth:`CFTimeIndex.get_loc` has removed the ``method`` and ``tolerance`` keyword arguments.
+  Use ``.get_indexer([key], method=..., tolerance=...)`` instead (:pull:`7361`).
+  By `Matthew Roeschke <https://github.com/mroeschke>`_.
 
 Deprecations
 ~~~~~~~~~~~~

xarray/coding/cftimeindex.py

@@ -463,12 +463,12 @@ def _filter_indexer_tolerance(self, target, indexer, tolerance):
         indexer = np.where(distance <= tolerance, indexer, -1)
         return indexer
 
-    def get_loc(self, key, method=None, tolerance=None):
+    def get_loc(self, key):
         """Adapted from pandas.tseries.index.DatetimeIndex.get_loc"""
         if isinstance(key, str):
             return self._get_string_slice(key)
         else:
-            return pd.Index.get_loc(self, key, method=method, tolerance=tolerance)
+            return super().get_loc(key)
 
     def _maybe_cast_slice_bound(self, label, side, kind=None):
         """Adapted from