[examples] Move some framework templates to pnpm. (#8883)

`pnpm` is our package manager of choice. This repository contains
framework starter templates, which check-in lockfiles to speed up clone
& deploy time. This PR updates a few frameworks to use `pnpm` instead of
`yarn` or `npm`.

- Updates Gatsby to Gatsby 5 given Node.js 18 support
- Updates to latest Nuxt 3 template for stable version
- Updates Astro to latest stable version, previously on RC
- Updates Angular to v15, previously on v13

examples/create-react-app/package.json

@@ -1,13 +1,13 @@
 {
   "private": true,
   "dependencies": {
-    "@testing-library/jest-dom": "^5.16.4",
-    "@testing-library/react": "^13.3.0",
-    "@testing-library/user-event": "^14.2.0",
-    "react": "^18.1.0",
-    "react-dom": "^18.1.0",
+    "@testing-library/jest-dom": "^5.16.5",
+    "@testing-library/react": "^13.4.0",
+    "@testing-library/user-event": "^14.4.3",
+    "react": "^18.2.0",
+    "react-dom": "^18.2.0",
     "react-scripts": "5.0.1",
-    "web-vitals": "^2.1.4"
+    "web-vitals": "^3.0.4"
   },
   "scripts": {
     "start": "react-scripts start",