fix(deps): update dependency @portabletext/toolkit to ^2.0.18

Author: renovate[bot]

package.json

@@ -69,7 +69,7 @@
     "useTabs": false
   },
   "dependencies": {
-    "@portabletext/toolkit": "^2.0.17",
+    "@portabletext/toolkit": "^2.0.18",
     "@portabletext/types": "^2.0.13"
   },
   "devDependencies": {