Stop trying to use cPickle, removed from python3

sandrotosi · ionelmc · commit 03003b012fee · 2021-12-25T17:59:54.000+02:00
cPickle has been removed in python3, and since lazy-object-proxy now only supports python3, we can remove it.

The effect of keeping it there is 300+ tests being skipped, confusing the test suite output
diff --git a/tests/test_lazy_object_proxy.py b/tests/test_lazy_object_proxy.py
@@ -1708,7 +1708,7 @@ def test_set_wrapped_regular(lop):
     assert obj + 1 == 2
 
 
-@pytest.fixture(params=["pickle", "cPickle"])
+@pytest.fixture(params=["pickle", ])
 def pickler(request):
     return pytest.importorskip(request.param)
 
