#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.
def test_docker_command_for_separate_container_lambda_executor(self):
        
        if not isinstance(lambda_api.LAMBDA_EXECUTOR,
                          lambda_executors.LambdaExecutorSeparateContainers):
            return
        executor = lambda_api.LAMBDA_EXECUTOR
        func_name = 'test_docker_command_for_separate_container_lambda_executor'
        func_arn = lambda_api.func_arn(func_name)
        handler = 'handler'
        lambda_cwd = '/app/lambda'
        network = 'compose_network'
        dns = 'some-ip-address'
        config.LAMBDA_DOCKER_NETWORK = network
        config.LAMBDA_DOCKER_DNS = dns
        try:
            cmd = executor.prepare_execution(
                func_arn, {}, LAMBDA_RUNTIME_NODEJS810, '', handler, lambda_cwd)
            expected = 'docker run -v "%s":/var/task   --network="%s"  --dns="%s"  --rm "lambci/lambda:%s" "%s"' % (
                lambda_cwd, network, dns, LAMBDA_RUNTIME_NODEJS810, handler)
            self.assertIn(('--network="%s"' % network), cmd,
                        'cmd=%s expected=%s' % (cmd, expected))
            self.assertIn(('--dns="%s"' % dns), cmd,
                        'cmd=%s expected=%s' % (cmd, expected))
        finally:
            config.LAMBDA_DOCKER_NETWORK = ''
            config.LAMBDA_DOCKER_DNS = ''
    def test_destroy_idle_containers(self):
        
        if not isinstance(lambda_api.LAMBDA_EXECUTOR,
                          lambda_executors.LambdaExecutorReuseContainers):