Add back the changelog entry of version 2.1.19

It was unexpectedly deleted by the release tool when releasing version 2.1.20

Author: eason9487

changelog.txt

@@ -7,6 +7,10 @@
 * Update - Require WooCommerce 10.3+.
 * Update - Require WordPress 6.8+.
 
+= 2.1.19 - 2025-10-30 =
+* Fix - Add safe script tag encoding flags to all `wp_json_encode()` calls in inline scripts.
+* Update - Require WooCommerce 10.2+.
+
 = 2.1.18 - 2025-10-01 =
 * Tweak - Don't throw errors when the product ID is not found for legacy Ajax add-to-cart.
 * Tweak - WC 10.2 compatibility.