CI: resolve conflict mypy and isort (#35339)

Author: fangchenli

pandas/tests/test_algos.py

@@ -6,7 +6,8 @@
 from numpy.random import RandomState
 import pytest
 
-from pandas._libs import algos as libalgos, groupby as libgroupby, hashtable as ht
+from pandas._libs import algos as libalgos, hashtable as ht
+from pandas._libs.groupby import group_var_float32, group_var_float64
 from pandas.compat.numpy import np_array_datetime64_compat
 import pandas.util._test_decorators as td
 
@@ -1493,7 +1494,7 @@ def test_group_var_constant(self):
 class TestGroupVarFloat64(GroupVarTestMixin):
     __test__ = True
 
-    algo = staticmethod(libgroupby.group_var_float64)
+    algo = staticmethod(group_var_float64)
     dtype = np.float64
     rtol = 1e-5
 
@@ -1516,7 +1517,7 @@ def test_group_var_large_inputs(self):
 class TestGroupVarFloat32(GroupVarTestMixin):
     __test__ = True
 
-    algo = staticmethod(libgroupby.group_var_float32)
+    algo = staticmethod(group_var_float32)
     dtype = np.float32
     rtol = 1e-2