fix(deps): update dependency webtorrent to v1.3.9

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
webtorrent (source)	1.3.8 -> 1.3.9

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Release Notes

webtorrent/webtorrent

### [`v1.3.9`](https://togithub.com/webtorrent/webtorrent/blob/master/CHANGELOG.md#​139-httpsgithubcomwebtorrentwebtorrentcomparev138v139-2021-08-06) [Compare Source](https://togithub.com/webtorrent/webtorrent/compare/v1.3.8...v1.3.9) ##### Bug Fixes - **deps:** update dependency create-torrent to ^5.0.1 ([#​2167](https://togithub.com/webtorrent/webtorrent/issues/2167)) ([283cbf8](https://togithub.com/webtorrent/webtorrent/commit/283cbf84bffd4fbd0b267796dc45f00491bcdc92))

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