fix: replace old config schemas for extensions and blueprints

to overcome a lot of warnings given during for example testing where
these extensions are used.

Signed-off-by: Hellgren Heikki <heikki.hellgren@op.fi>

plugins/search/package.json

@@ -71,7 +71,8 @@
     "@material-ui/core": "^4.12.2",
     "@material-ui/icons": "^4.9.1",
     "qs": "^6.9.4",
-    "react-use": "^17.2.4"
+    "react-use": "^17.2.4",
+    "zod": "^3.25.76 || ^4.0.0"
   },
   "devDependencies": {
     "@backstage/cli": "workspace:^",