Update dependency web-ext to v6.8.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
web-ext	6.7.0 -> 6.8.0

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Release Notes

mozilla/web-ext

### [`v6.8.0`](https://togithub.com/mozilla/web-ext/releases/6.8.0) [Compare Source](https://togithub.com/mozilla/web-ext/compare/6.7.0...6.8.0) ##### Features - `web-ext lint`: Updated to use addons-linter v4.14.0 ([#​2386](https://togithub.com/mozilla/web-ext/issues/2386)) - Imported Firefox 98.0b10 API schema - Updated browser-compat-data - Fixed TypeError raised in opendialog-remote-uri rule - See all addons-linter changes: [4.9.0...4.14.0](https://togithub.com/mozilla/addons-linter/compare/4.9.0...4.14.0) ##### Bug Fixes - `web-ext run`: - Improved debounce to prevent multiple extension reloads on consecutive file changes ([#​2385](https://togithub.com/mozilla/web-ext/issues/2385)) ([6c53a01](https://togithub.com/mozilla/web-ext/commit/6c53a01673edd234afc4b5f042a3e453d4419723)) - Replaced deprecated dependency event-to-promise with promise-toolbox/fromEvent ([#​2367](https://togithub.com/mozilla/web-ext/issues/2367)) ([2cfd843](https://togithub.com/mozilla/web-ext/commit/2cfd843d4ca351a022cd2789cbd3f40de298ad3d)) See all changes [6.7.0...6.8.0](https://togithub.com/mozilla/web-ext/compare/6.7.0...6.8.0)

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