Update regex to handle version tags like -rc and -beta in plugin …

…download links

plugins/performance-lab/includes/admin/plugins.php

@@ -373,7 +373,7 @@ function perflab_install_and_activate_plugin( string $plugin_slug, array &$proce
 		$skin     = new WP_Ajax_Upgrader_Skin( array( 'api' => $plugin_data ) );
 		$upgrader = new Plugin_Upgrader( $skin );
 		// Remove the version number from the link to download the latest plugin version.
-		$download_link = (string) preg_replace( '#(\/plugin\/[^\/]+)\.\d+\.\d+\.\d+\.zip#', '$1.zip', $plugin_data['download_link'] );
+		$download_link = (string) preg_replace( '#(\/plugin\/[^\/]+)\.\d+\.\d+\.\d+(?:-\w+)?\.zip#', '$1.zip', $plugin_data['download_link'] );
 		$result        = $upgrader->install( $download_link );
 
 		if ( is_wp_error( $result ) ) {