Also skip test_check_probes in the CI

It is already skipped in the spec.
The reason it did not fail before is that it was skipped due to missing dtrace,
which was added in https://src.fedoraproject.org/tests/python/pull-request/55

plan.fmf

@@ -3,7 +3,9 @@ execute:
 
 environment:
     VERSION: 3.11
-    X: ''
+    # the X variable is what is passed as arguments to python -m test
+    # test_check_probes https://github.com/python/cpython/issues/104280#issuecomment-1669249980
+    X: '-i test_check_probes'
 
 discover:
     how: fmf