PLANET-7565: Upgrade to Wordpress 6.6.1 (#44)

* PLANET-7565: Upgrade to Wordpress 6.6

- Wordpress was upgraded to the last stable version

* PLANET-7565: Upgrade to Wordpress 6.6.1

- Wordpress was upgraded to the last stable version

* PLANET-7565: Change master theme branch

- The master theme branch connection was changed to check that the tests failing with WP v6.6 are now fixed.

* PLANET 7565: Revert changes in the env file

- Changes to the env file related to the connection to the master theme were reverted.

.wp-env.json

@@ -1,6 +1,6 @@
 {
   "phpVersion": "8.1",
-  "core": "WordPress/WordPress#6.5.3",
+  "core": "WordPress/WordPress#6.6.1",
   "mappings": {
     "wp-content": "./planet4"
   },