build(deps-dev): bump web-ext from 5.4.0 to 5.4.1 in /addon (#698)

Bumps [web-ext](https://github.com/mozilla/web-ext) from 5.4.0 to 5.4.1.
- [Release notes](https://github.com/mozilla/web-ext/releases)
- [Commits](mozilla/web-ext@5.4.0...5.4.1)

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