Fix dynamic prop declaration warning in cart code

plugins/woocommerce/includes/class-wc-cart-totals.php

@@ -117,6 +117,13 @@ final class WC_Cart_Totals {
 		'discounts_total'    => 0,
 	);
 
+	/**
+	 * Cache of tax rates for a given tax class.
+	 *
+	 * @var array
+	 */
+	protected $item_tax_rates;
+
 	/**
 	 * Sets up the items provided, and calculate totals.
 	 *

plugins/woocommerce/includes/legacy/class-wc-legacy-cart.php

@@ -18,6 +18,7 @@ if ( ! defined( 'ABSPATH' ) ) {
 /**
  * Legacy cart class.
  */
+#[AllowDynamicProperties]
 abstract class WC_Legacy_Cart {
 
 	/**