disable MacOS Spark test

tests/pipeline_backend_test.py

@@ -352,11 +352,8 @@ def test_sum_per_key(self):
         result = self.backend.sum_per_key(data).collect()
         self.assertEqual(set(result), {(1, 6), (2, -2), (3, 8), (10, 5)})
 
-    @unittest.skipIf(
-        sys.platform == "darwin" and sys.version_info.major == 3 and
-        (sys.version_info.minor == 8 or sys.version_info.minor == 9),
-        "There are some problems with PySpark setup on macOS in python 3.8 "
-        "and 3.9.")
+    @unittest.skipIf(sys.platform == "darwin",
+                     "There are some problems with PySpark setup on macOS")
     def test_combine_accumulators_per_key(self):
         data = self.sc.parallelize([(1, 2), (2, 1), (1, 4), (3, 8), (2, 3)])
         rdd = self.backend.group_by_key(data)