fix: replace deprecated fs.F_OK with fs.constants.F_OK [DEP0149]

[vinay070403]

Summary

This PR replaces usage of the deprecated fs.F_OK constant with fs.constants.F_OK in packages/react-dev-utils/checkRequiredFiles.js.

This resolves the Node.js DeprecationWarning:

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Why

• fs.F_OK is deprecated in Node.js and may be removed in future versions.
• Using fs.constants.F_OK is the recommended approach.
• Prevents deprecation warnings during build and runtime.

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Related Issue

Fixes #17131

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Verification

• [x] Updated checkRequiredFiles.js
• [x] Ran yarn test locally, all tests passed
• [x] Confirmed no deprecation warning appears on Node.js 18+

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✅ Ready for review.

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[mdgm88]

I am seeing this deprecation warning too. It would be great if this could be merged soon.