chore: apigw test event wrongly set with base64

Signed-off-by: Heitor Lessa <[email protected]>

Author: heitorlessa

tests/events/apiGatewayProxyEvent.json

@@ -76,5 +76,5 @@
   "pathParameters": null,
   "stageVariables": null,
   "body": "Hello from Lambda!",
-  "isBase64Encoded": true
-}
+  "isBase64Encoded": false
+}