Bump webpush from 0.3.7 to 0.3.8 (#10592)

Bumps [webpush](https://github.com/zaru/webpush) from 0.3.7 to 0.3.8.
- [Release notes](https://github.com/zaru/webpush/releases)
- [Changelog](https://github.com/zaru/webpush/blob/master/CHANGELOG.md)
- [Commits](https://github.com/zaru/webpush/compare/v0.3.7...v0.3.8

)

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