Upgrade React from c0cd4d5d-20260527 to 6b5ea125-20260528

[vercel-release-bot]

diff facebook/react@c0cd4d5d...6b5ea125

React upstream changes

• [ci] Create artifact attestations for builds on backport branches facebook/react#36558
• [Flight] Fix stranded row content under Node stream backpressure facebook/react#36516
• [ci] Allow CI on backport branches facebook/react#36551

[github-actions]

Failing test suites

Commit: de5d714 | About building and testing Next.js

pnpm test-dev test/development/app-dir/hmr-intercept-routes/hmr-intercept-routes.test.ts (job)

• hmr-intercept-routes > should update intercept routes via HMR (DD)

Expand output

● hmr-intercept-routes › should update intercept routes via HMR

page.waitForSelector: Timeout 10000ms exceeded.
Call log:
  - waiting for locator('#default-intercept') to be visible

  545 |
  546 |     return this.startChain(async () => {
> 547 |       const el = await page.waitForSelector(selector, {
      |                             ^
  548 |         timeout,
  549 |         state,
  550 |       })

  at waitForSelector (lib/browsers/playwright.ts:547:29)
  at Playwright._chain (lib/browsers/playwright.ts:677:23)
  at Playwright._chain [as startChain] (lib/browsers/playwright.ts:658:17)
  at Playwright.startChain [as waitForElementByCss] (lib/browsers/playwright.ts:546:17)
  at Object.waitForElementByCss (development/app-dir/hmr-intercept-routes/hmr-intercept-routes.test.ts:38:21)

[github-actions]

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