BUG: Fix pc.power_checked min version (#47752)

Author: mroeschke

pandas/core/arrays/arrow/array.py

@@ -18,6 +18,7 @@
 from pandas.compat import (
     pa_version_under1p01,
     pa_version_under2p0,
+    pa_version_under4p0,
     pa_version_under5p0,
     pa_version_under6p0,
 )
@@ -121,9 +122,9 @@ def floordiv_compat(
         "rmod": NotImplemented,
         "divmod": NotImplemented,
         "rdivmod": NotImplemented,
-        "pow": NotImplemented if pa_version_under2p0 else pc.power_checked,
+        "pow": NotImplemented if pa_version_under4p0 else pc.power_checked,
         "rpow": NotImplemented
-        if pa_version_under2p0
+        if pa_version_under4p0
         else lambda x, y: pc.power_checked(y, x),
     }