fix: remove type hints from unimported libs (#450)

Lambda func is not bundled with a layer that includes the
aws_lambda_powertools python package. Since this package was only used
for type hinting, and since those types are encapsulated in docstrings
for relevant functions, remove the imports.

Signed-off-by: Gavin Inglis <[email protected]>

lib/image-scanning-notifications-lambda-handler/main.py

@@ -4,10 +4,8 @@
 '''
 import boto3
 import os
-from aws_lambda_powertools.utilities.data_classes import EventBridgeEvent
-from aws_lambda_powertools.utilities.typing import LambdaContext
 
-def build_message(event: EventBridgeEvent):
+def build_message(event):
     '''build_message reads an {event} from Inspector image scanning and builds 
     the body of reporting email with vulnerability findings.
 
@@ -50,7 +48,12 @@ def send_sns(subject: str, message: str):
     topic_arn = os.environ["SNS_ARN"]
     client.publish(TopicArn=topic_arn, Message=message, Subject=subject)
 
-def lambda_handler(event: EventBridgeEvent, context: LambdaContext) -> dict:
+def lambda_handler(event, context) -> dict:
+    '''lambda_handler handles EventBridge events, calling send_sns to send an email for security findings.
+    
+    :param EventBridgeEvent event: the EventBridge event
+    :param LambdaContext context: the Lambda execution context
+    '''
     detailType = event["detail-type"]
 
     if (detailType == "Inspector2 Finding"):