AWS supports the following Ruby runtimes:

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Name | Identifier | SDK for Ruby | Operating system
-- | -- | -- | --
Ruby 2.7 | ruby2.7 | 3.0.1 | Amazon Linux 2
Ruby 2.5 | ruby2.5 | 3.0.1 | Amazon Linux

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Currently, `localstack/lambda` only contains the `ruby2.5` tag. Will the 2.7 runtime be supported in the (near) future?
dynamodb_client.delete_table(TableName=ddb_table)
        lambda_client.delete_function(FunctionName=function_name)
    def test_deletion_event_source_mapping_with_dynamodb(self):
        function_name = 'lambda_func-{}'.format(short_uid())
        ddb_table = 'ddb_table-{}'.format(short_uid())
        testutil.create_lambda_function(
            handler_file=TEST_LAMBDA_ECHO_FILE,
            func_name=function_name,
            runtime=LAMBDA_RUNTIME_PYTHON36
        )
        table_arn = aws_stack.create_dynamodb_table(ddb_table, partition_key='id')['TableDescription']['TableArn']
        lambda_client = aws_stack.connect_to_service('lambda')
        lambda_client.create_event_source_mapping(
            FunctionName=function_name,
            EventSourceArn=table_arn
        )
        dynamodb_client = aws_stack.connect_to_service('dynamodb')
        dynamodb_client.delete_table(TableName=ddb_table)
        result = lambda_client.list_event_source_mappings(EventSourceArn=table_arn)
        self.assertEqual(len(result['EventSourceMappings']), 0)
        
        lambda_client.delete_function(FunctionName=function_name)
    def test_event_source_mapping_with_sqs(self):
        lambda_client = aws_stack.connect_to_service('lambda')
        sqs_client = aws_stack.connect_to_service('sqs')
        function_name = 'lambda_func-{}'.format(short_uid())
        queue_name_1 = 'queue-{}-1'.format(short_uid())
        testutil.create_lambda_function(
            handler_file=TEST_LAMBDA_ECHO_FILE,
            func_name=function_name,