Bootstrap/Load: Change "Insufficient Requirements" wp_die() heading to "Requirements Not Met", which is more appropriate for the context it's used in.

Props yoavf.
Fixes #47575.

git-svn-id: https://develop.svn.wordpress.org/trunk@45770 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/load.php

@@ -150,7 +150,7 @@ function wp_check_php_mysql_versions() {
 		);
 		wp_die(
 			__( 'Your PHP installation appears to be missing the MySQL extension which is required by WordPress.' ),
-			__( 'Insufficient Requirements' ),
+			__( 'Requirements Not Met' ),
 			$args
 		);
 		exit( 1 );