Downgrade TypeScript to 4.9.5

For compatibility with react-scripts.

See: facebook/create-react-app#13080

Author: mcollins-ttd

examples/google-secure-signals-integration/react_client_side/package-lock.json

@@ -11,7 +11,8 @@
     "react": "19.2.1",
     "react-dom": "19.2.1",
     "react-scripts": "^5.0.1",
-    "svgo": "^3.3.2"
+    "svgo": "^3.3.2",
+    "typescript": "^4.9.5"
   },
   "devDependencies": {
     "@babel/plugin-proposal-private-property-in-object": "^7.21.0"