Lock framework version to 2.12

Author: schlessera

composer.json

@@ -34,7 +34,7 @@
     "wp-cli/shell-command": "^2",
     "wp-cli/super-admin-command": "^2",
     "wp-cli/widget-command": "^2",
-    "wp-cli/wp-cli": "dev-main",
+    "wp-cli/wp-cli": "^2.12",
     "wp-cli/process": "5.9.99"
   },
   "require-dev": {