Move builtin classmethod_descriptor to a different test

This patch mvoes the builtin classmethod descriptor test to a different
one and mark it to skip for python >= 3.10.8. The classmethod descriptor
serializarion was removed from python in these releases:
https://docs.python.org/3.10/whatsnew/changelog.html#id3

More information in the github issue:
python/cpython#95196

Fix cloudpipe#485

Author: danigm

tests/cloudpickle_test.py

@@ -868,21 +868,16 @@ def test_builtin_classicmethod(self):
         assert depickled_unbound_meth is unbound_classicmethod
         assert depickled_clsdict_meth is clsdict_classicmethod
 
-
     def test_builtin_classmethod(self):
         obj = 1.5  # float object
 
         bound_clsmethod = obj.fromhex  # builtin_function_or_method
         unbound_clsmethod = type(obj).fromhex  # builtin_function_or_method
-        clsdict_clsmethod = type(
-            obj).__dict__['fromhex']  # classmethod_descriptor
 
         depickled_bound_meth = pickle_depickle(
             bound_clsmethod, protocol=self.protocol)
         depickled_unbound_meth = pickle_depickle(
             unbound_clsmethod, protocol=self.protocol)
-        depickled_clsdict_meth = pickle_depickle(
-            clsdict_clsmethod, protocol=self.protocol)
 
         # float.fromhex takes a string as input.
         arg = "0x1"
@@ -893,6 +888,21 @@ def test_builtin_classmethod(self):
         assert depickled_bound_meth(arg) == bound_clsmethod(arg)
         assert depickled_unbound_meth(arg) == unbound_clsmethod(arg)
 
+    @pytest.mark.skipif(
+        sys.version_info >= (3, 10, 8),
+        reason="Disabled classmethod_descriptor pickle https://github.com/python/cpython/issues/95196"
+    )
+    def test_builtin_classmethod_descriptor(self):
+        obj = 1.5  # float object
+
+        clsdict_clsmethod = type(
+            obj).__dict__['fromhex']  # classmethod_descriptor
+
+        depickled_clsdict_meth = pickle_depickle(
+            clsdict_clsmethod, protocol=self.protocol)
+
+        # float.fromhex takes a string as input.
+        arg = "0x1"
         if platform.python_implementation() == 'CPython':
             # Roundtripping a classmethod_descriptor results in a
             # builtin_function_or_method (CPython upstream issue).