[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

src/cloudevents/core/v1/event.py

@@ -20,7 +20,7 @@
 
 
 class CloudEvent:
-    def __init__(self, attributes: dict, data: Optional[dict] = None) -> 'CloudEvent':
+    def __init__(self, attributes: dict, data: Optional[dict] = None) -> "CloudEvent":
         """
         Create a new CloudEvent instance.
 
@@ -92,10 +92,10 @@ def __validate_attribute(self, attributes: dict):
     def get_attribute(self, attribute: str) -> Optional[Any]:
         """
         Retrieve a value of an attribute of the event denoted by the given `attribute`.
-        
+
         :param attribute: The name of the event attribute to retrieve the value for.
         :type attribute: str
-        
+
         :return: The event attribute value.
         :rtype: Optional[Any]
         """