Update dummy app Babel to ^7.22.0 for pnpm compatibility

pnpm's strict dependency resolution doesn't hoist the root's newer
Babel version like Yarn did. Update the dummy app's Babel versions
to be compatible with @babel/plugin-syntax-import-attributes.

Also includes the JSON.stringify fix for ESLint.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: justin808

react_on_rails/spec/dummy/package.json

@@ -7,7 +7,7 @@
   },
   "private": true,
   "dependencies": {
-    "@babel/runtime": "7.17.9",
+    "@babel/runtime": "^7.22.0",
     "@hotwired/turbo-rails": "^8.0.4",
     "core-js": "3",
     "create-react-class": "^15.6.3",
@@ -29,7 +29,7 @@
     "regenerator-runtime": "^0.13.4"
   },
   "devDependencies": {
-    "@babel/core": "7.17.9",
+    "@babel/core": "^7.22.0",
     "@babel/plugin-transform-runtime": "7.17.0",
     "@babel/preset-env": "7",
     "@babel/preset-react": "^7.10.4",