PLANET-8061: Upgrade WordPress to v6.9 (#62)

- Upgrade WordPress to v6.9

Author: mardelnet

.wp-env.json

@@ -1,6 +1,6 @@
 {
   "phpVersion": "8.1",
-  "core": "WordPress/WordPress#6.8.1",
+  "core": "WordPress/WordPress#6.9",
   "mappings": {
     "wp-content": "./planet4"
   },