Update TestExternalPythonDecorator tests

tests/decorators/test_external_python.py

@@ -61,18 +61,18 @@ def venv_python_with_dill():
 
 class TestExternalPythonDecorator:
     def test_with_dill_works(self, dag_maker, venv_python_with_dill):
-        @task.external_python(python=venv_python_with_dill, use_dill=True)
+        @task.external_python(python=venv_python_with_dill, use_cloudpickle=True)
         def f():
-            """Import dill to double-check it is installed ."""
-            import dill  # noqa: F401
+            """Import cloudpickle to double-check it is installed ."""
+            import cloudpickle # noqa: F401
 
         with dag_maker():
             ret = f()
 
         ret.operator.run(start_date=DEFAULT_DATE, end_date=DEFAULT_DATE)
 
-    def test_no_dill_installed_raises_exception_when_use_dill(self, dag_maker, venv_python):
-        @task.external_python(python=venv_python, use_dill=True)
+    def test_no_cloudpickle_installed_raises_exception_when_use_cloudpickle(self, dag_maker, venv_python):
+        @task.external_python(python=venv_python, use_cloudpickle=True)
         def f():
             pass