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?
lambda_client = aws_stack.connect_to_service('lambda')
        
        action = 'lambda:InvokeFunction'
        principal = 's3.amazonaws.com'
        statement_ids = ['s4', 's5']
        for sid in statement_ids:
            resp = lambda_client.add_permission(FunctionName=function_name, Action=action,
                                                StatementId=sid, Principal=principal,
                                                SourceArn=aws_stack.s3_bucket_arn('test-bucket'))
            self.assertIn('Statement', resp)
        
        policies = iam_client.list_policies(Scope='Local', MaxItems=500)['Policies']
        matching = [p for p in policies if p['PolicyName'] == 'lambda_policy_%s' % function_name]
        self.assertEqual(len(matching), 1)
        self.assertIn(':policy/', matching[0]['Arn'])
        
        policy = matching[0]
        versions = iam_client.list_policy_versions(PolicyArn=policy['Arn'])['Versions']
        self.assertEqual(len(versions), 1)
        statements = versions[0]['Document']['Statement']
        for i in range(len(statement_ids)):
            self.assertEqual(statements[i]['Action'], action)
            self.assertEqual(statements[i]['Resource'], lambda_api.func_arn(function_name))
            self.assertEqual(statements[i]['Principal']['Service'], principal)
            self.assertEqual(statements[i]['Condition']['ArnLike']['AWS:SourceArn'],
                             aws_stack.s3_bucket_arn('test-bucket'))
            
            self.assertEqual(statements[i]['Sid'], statement_ids[abs(i - 1)])
        
        resp = lambda_client.remove_permission(FunctionName=function_name,