fields missing in APIGatewayV2WebSocketEvent object methods

[brackxm]

the equals, hashCode, and toString methods of APIGatewayV2WebSocketEvent are only based on 3 iso all fields

https://github.com/aws/aws-lambda-java-libs/blob/master/aws-lambda-java-events/src/main/java/com/amazonaws/services/lambda/runtime/events/APIGatewayV2WebSocketEvent.java#L665

[msailes]

fixed in v3.9.0