Adapt error message to expect for WP Core < 5.9

Author: schlessera

features/install-wp-tests.feature

@@ -219,7 +219,7 @@ Feature: Scaffold install-wp-tests.sh tests
     Then the return code should be 1
     And STDOUT should contain:
       """
-      The scaffolded tests cannot currently be run on PHP 8.0+. See https://github.com/wp-cli/scaffold-command/issues/285
+      Looks like you're using PHPUnit 9.5.8. WordPress requires at least PHPUnit 5.4 and is currently only compatible with PHPUnit up to 7.x.
       """
 
     When I try `WP_TESTS_DIR={RUN_DIR}/wordpress-tests-lib WP_CORE_DIR={RUN_DIR}/wordpress /usr/bin/env bash {PLUGIN_DIR}/hello-world/bin/install-wp-tests.sh wp_cli_test_scaffold {DB_USER} {DB_PASSWORD} {DB_HOST} latest < affirmative-response`