docs: React Router v7 -> v8 in vite plugin README

[nickbabcock]

Cloudflare docs state that react router v8 is supported: https://developers.cloudflare.com/workers/framework-guides/web-apps/react-router/

But the readme still says v7!

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because: this is just a readme fix
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: this is just a readme fix

---

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[workers-devprod]

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[devin-ai-integration]

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