Fix tests involving WordPress 7.0 (#332)

Author: swissspidy

features/core-check-update-db.feature

@@ -43,6 +43,7 @@ Feature: Check if WordPress database update is needed
       Success: WordPress database is up to date.
       """
 
+  @require-php-7.4
   Scenario: Check if database update is needed across network
     Given a WP multisite install
     And a disable_sidebar_check.php file:

features/core-update.feature

@@ -161,7 +161,7 @@ Feature: Update WordPress core
       Downloading
       """
 
-  @require-php-7.0
+  @require-php-7.4
   Scenario: Don't run update when up-to-date
     Given a WP install
     And I run `wp core update`
@@ -387,6 +387,7 @@ Feature: Update WordPress core
       Success:
       """
 
+  @require-php-7.4
   Scenario: No HTML output from async translation updates during core update
     Given a WP install
     And an empty cache