Build/Test: Remove PHP 7.4 from allowed failures

PHP7.4 is supported in WordPress 5.3. 🐘 🎉

Fixes: #48232.


Built from https://develop.svn.wordpress.org/trunk@46547


git-svn-id: http://core.svn.wordpress.org/trunk@46344 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-beta3-46546';
+$wp_version = '5.3-beta3-46547';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.