Reintroduce PANDAS_GE_220 import (#15287)

This was required by #15109, but removed by the changes in #15145 and the merge order was such that they weren't tested against each other.

Authors:
  - Lawrence Mitchell (https://github.com/wence-)

Approvers:
  - Bradley Dice (https://github.com/bdice)
  - GALI PREM SAGAR (https://github.com/galipremsagar)

URL: #15287

python/cudf/cudf/tests/test_groupby.py

@@ -20,7 +20,11 @@
 import cudf
 from cudf import DataFrame, Series
 from cudf.api.extensions import no_default
-from cudf.core._compat import PANDAS_CURRENT_SUPPORTED_VERSION, PANDAS_VERSION
+from cudf.core._compat import (
+    PANDAS_CURRENT_SUPPORTED_VERSION,
+    PANDAS_GE_220,
+    PANDAS_VERSION,
+)
 from cudf.core.udf._ops import arith_ops, comparison_ops, unary_ops
 from cudf.core.udf.groupby_typing import SUPPORTED_GROUPBY_NUMPY_TYPES
 from cudf.core.udf.utils import UDFError, precompiled