#2093  # Type of request: This is a ...

[*] bug report
[ ] feature request

# Detailed description
Unable to invoke lambda function compiled in java 11. Localstack latest image still shows java version 8.

## Expected behavior
Should be able to invoke lambda function compiled in java 11.

## Actual behavior
Getting error-
Exception in thread "main" java.lang.UnsupportedClassVersionError: publisFunction has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0

# Steps to reproduce

docker-compose up -d
Create lambda function
Create SQS 
map lambda and sqs
send message to SQS to invoke lambda

Error message SS:
![image](https://user-images.githubusercontent.com/54183749/96603894-1a561c00-12ba-11eb-9d40-a19370a7c3aa.png)

![LS_error](https://user-images.githubusercontent.com/54183749/96603954-293cce80-12ba-11eb-9566-3942f96e564a.png)


Similar issue was reported #2093.  Couldn't find the answer if that was fixed and latest image of Localstack should compile in JAVA 11.
result_data1 = result1['Payload'].read()
            result2 = self.lambda_client.invoke(FunctionName=lambda_name2, Payload=b'{}')
            result_data2 = result2['Payload'].read()
            self.assertEqual(result1['StatusCode'], 200)
            self.assertIn('setting1', to_str(result_data1))
            self.assertEqual(result2['StatusCode'], 200)
            self.assertIn('setting2', to_str(result_data2))
            
            testutil.delete_lambda_function(lambda_name1)
            testutil.delete_lambda_function(lambda_name2)
        finally:
            lambda_api.DO_USE_DOCKER = original_do_use_docker
    def test_lambda_subscribe_sns_topic(self):
        function_name = '{}-{}'.format(TEST_LAMBDA_FUNCTION_PREFIX, short_uid())
        testutil.create_lambda_function(handler_file=TEST_LAMBDA_ECHO_FILE,
                                        func_name=function_name, runtime=LAMBDA_RUNTIME_PYTHON36)
        topic = self.sns_client.create_topic(Name=TEST_SNS_TOPIC_NAME)
        topic_arn = topic['TopicArn']
        self.sns_client.subscribe(
            TopicArn=topic_arn,
            Protocol='lambda',
            Endpoint=lambda_api.func_arn(function_name),
        )
        subject = '[Subject] Test subject'
        message = 'Hello world.'
        self.sns_client.publish(
            TopicArn=topic_arn,
            Subject=subject,
            Message=message
        )