Fix tests involving WordPress 7.0 (#386)

Author: swissspidy

features/install-wp-tests.feature

@@ -16,7 +16,7 @@ Feature: Scaffold install-wp-tests.sh tests
       """
     And the return code should be 1
 
-  @less-than-php-8.0 @require-php-7.0 @require-mysql
+  @less-than-php-8.0 @require-php-7.4 @require-mysql
   Scenario: Install latest version of WordPress
     Given a WP install
     And a affirmative-response file:

features/scaffold-theme-tests.feature

@@ -8,7 +8,7 @@ Feature: Scaffold theme unit tests
     When I run `wp theme path`
     Then save STDOUT as {THEME_DIR}
 
-  @require-php-7.0 @require-mysql
+  @require-php-7.4 @require-mysql
   Scenario: Scaffold theme tests
     When I run `wp scaffold theme-tests t12child`
     Then STDOUT should not be empty