[HIGH] Bump browserslist to 4.28.9

[OskarEichler]

Summary

• update the existing Browserslist resolutions from 4.24.4 to 4.28.9
• remediate GHSA-c83g-rgw3-j3cx (unbounded query-cache growth)
• remediate GHSA-73wf-gq98-2v4g (uncaught crash/prototype write through custom stats)
• keep the change limited to the lockfile and the already-compatible 4.x dependency range

Security impact

Browserslist 4.24.4 is affected by two high-severity advisories fixed in 4.28.7. This update uses 4.28.9, the latest 4.x release, without changing React Native package manifests.

Verification

• yarn install --frozen-lockfile --ignore-scripts
• yarn why browserslist (single 4.28.9 installation)
• yarn audit no longer reports either Browserslist advisory
• yarn build
• yarn test packages/react-native-babel-preset --runInBand (5 suites, 117 tests, 16 snapshots)
• git diff --check

[github-actions]

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