chore: bumped wordpress version for test workflow

Author: chaddgrimm

.github/workflows/test.yaml

@@ -10,7 +10,7 @@ jobs:
       matrix:
         include:
           - node-version: '14.x'
-            WORDPRESS_VERSION: 5.7.2
+            WORDPRESS_VERSION: 5.8.3
             PHP_VERSION: 7.4
             WOOCOMMERCE_VERSION: 5.7.1
             WORDPRESS_THEME: twentytwenty