Update React in playgrounds and e2es to 19.2.1

[jamesopstad]

No vulnerabilities here but updating as we might as well.

---

• Tests
  • Tests included/updated
  • Tests not necessary because: already covered
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: internal change
• Wrangler V3 Backport
  • Wrangler PR:
  • Not necessary because: not a Wrangler change

[changeset-bot]

⚠️ No Changeset found

Latest commit: 09eb063

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commit: 09eb063