REST API: Remove unused variable in `WP_REST_Server::match_request_to_handler()`.

Previously initialized in `WP_REST_Server::dispatch()`, the `$response` variable became unused when the logic was split into two new methods, `::match_request_to_handler()` and `::respond_to_request()`.

Follow-up to [34928], [48947].

Props upadalavipul, mukesh27.
Fixes #59420.
Built from https://develop.svn.wordpress.org/trunk@56645


git-svn-id: http://core.svn.wordpress.org/trunk@56157 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/rest-api/class-wp-rest-server.php

@@ -1079,7 +1079,6 @@ class WP_REST_Server {
 
 			foreach ( $handlers as $handler ) {
 				$callback = $handler['callback'];
-				$response = null;
 
 				// Fallback to GET method if no HEAD method is registered.
 				$checked_method = $method;

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.4-alpha-56644';
+$wp_version = '6.4-alpha-56645';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.