react-sync: Ignore update notices from npm (#71717)
`npm view` prints a notice when a new update is available
to `stderr` tricking us into thinking there was an error.
```
npm notice
npm notice New minor version of npm available! 10.7.0 -> 10.9.0
npm notice Changelog: https://github.com/npm/cli/releases/tag/v10.9.0
npm notice To update run: npm install -g npm@10.9.0
npm notice
```
Running with `--silent` avoids these unrelated warnings (see https://github.com/npm/npm/issues/2040#issuecomment-3504495).
## Test plan
https://github.com/vercel/next.js/pull/71718
