Fix typo

The exception is expected, not excepted. Well, I guess it is also
excepted, because it's an exception, but you get what I mean.

Author: unflxw

tests/opentelemetry-docker-tests/tests/celery/test_celery_functional.py

@@ -420,7 +420,7 @@ def run(self):
     assert "Task class is failing" in span.status.description
 
 
-def test_class_task_exception_excepted(celery_app, memory_exporter):
+def test_class_task_exception_expected(celery_app, memory_exporter):
     class BaseTask(celery_app.Task):
         throws = (MyException,)