test: fix error message in 'validate'

`cfn-lint` changed their message when a Lambda runtime is deprecated [1]

From `Check if EOL Lambda Function Runtimes are used`
To `Validate if lambda runtime is deprecated`

And also using nodejs16.x changed from a warning (W2531) to an error (E2531)

[1]: aws-cloudformation/cfn-lint@31783ca#diff-3e96ba21727bba3d7bfb0c5c235a0cbc45eca97819429104d7ff9fbec8aa05b2

Author: valerena

tests/integration/validate/test_validate_command.py

@@ -157,8 +157,8 @@ def test_lint_deprecated_runtimes(self, runtime):
             self.assertEqual(command_result.process.returncode, 1)
             self.assertRegex(
                 output,
-                f"\\[\\[W2531: Check if EOL Lambda Function Runtimes are used] "
-                f"\\(Runtime \\'{runtime}'\\ was deprecated on.*",
+                f"\\[\\[E2531: Validate if lambda runtime is deprecated\\] "
+                f"\\(Runtime '{runtime}' was deprecated on.*",
             )
 
     def test_lint_supported_runtimes(self):