Use super().__init__ instead of explicitly calling named super-class. (#9166)

* Use super().__init__ instead of explicitly calling named super-class.

* Fix unittest (typo fix).

certbot/certbot/_internal/error_handler.py

@@ -167,6 +167,7 @@ class ErrorHandler:
             logger.debug("Calling signal %s", signum)
             os.kill(os.getpid(), signum)
 
+
 class ExitHandler(ErrorHandler):
     """Context manager for running code that must be cleaned up.
 
@@ -175,5 +176,5 @@ class ExitHandler(ErrorHandler):
     regular exit.
     """
     def __init__(self, func: Callable[..., Any], *args: Any, **kwargs: Any) -> None:
-        ErrorHandler.__init__(self, func, *args, **kwargs)
+        super().__init__(func, *args, **kwargs)
         self.call_on_regular_exit = True

certbot/tests/plugins/dns_common_test.py

@@ -133,7 +133,7 @@ class CredentialsConfigurationTest(test_util.TempDirTestCase):
 
         def __init__(self, *args, **kwargs):
             self.reset()
-            logging.Handler.__init__(self, *args, **kwargs)
+            super().__init__(*args, **kwargs)
 
         def emit(self, record):
             self.messages[record.levelname.lower()].append(record.getMessage())