Bump webpush from 0.3.5 to 0.3.6 (#9783)

Bumps [webpush](https://github.com/zaru/webpush) from 0.3.5 to 0.3.6.
- [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/v0.3.5...v0.3.6

)

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