Expire theme cache in case a theme is updated outside WordPress

If someone updates their theme outside of the WordPress update process
(by manipulating files directly) the cache won't be invalidated. To deal
with that, we're setting the TTL here to 1hr.

plugins/woocommerce/includes/rest-api/Controllers/Version2/class-wc-rest-system-status-v2-controller.php

@@ -1171,7 +1171,7 @@ class WC_REST_System_Status_V2_Controller extends WC_REST_Controller {
 			);
 
 			$theme_info = array_merge( $active_theme_info, $parent_theme_info );
-			set_transient( 'wc_system_status_theme_info', $theme_info );
+			set_transient( 'wc_system_status_theme_info', $theme_info, HOUR_IN_SECONDS );
 		}
 
 		return $theme_info;