fix(dev-utils): replace write-file-atomic with atomically

[serhalp]

write-file-atomic has a known issue with EPERM errors on Windows CI during atomic rename operations (npm/write-file-atomic#227). The package doesn't have retry logic and is largely unmaintained 😬.

atomically is a modern, popular (7M downloads/wk) replacement that:

• Retries EPERM/EBUSY/EACCES errors automatically (7.5s timeout)
• Uses stubborn-fs for Windows compatibility
• Has native TypeScript types (no @types package needed) and ESM
• Same API surface

This should fix flaky Windows CI failures.

See https://npmx.dev/compare?packages=write-file-atomic,atomically.

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