test(deps): update examples/nextjs (e2) to v15

[MikeMcC399]

Issue

The examples/nextjs was originally created for Next.js 13.x with React 18.x and it was later migrated to Next.js 14.x, also with React 18.x.

Next.js 14.x has been replaced by Next.js 15.x with React 19.x as the latest release.

The current example, using [email protected], reports also a moderate severity vulnerability (CVE-2024-56332).

Change

Regenerate a Next.js 15.x project into the examples/nextjs directory using:

npx create-next-app@latest nextjs --js --tailwind --no-eslint --app --src-dir --turbopack --no-import-alias --use-npm

See CLI create-next-app

Modify the Cypress test according to the new default page content from Vercel Next.js v15.

[cypress-app-bot]

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