Update dependency web-ext to ^4.2.0

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
web-ext	devDependencies	minor	^4.2.0	source

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Release Notes

mozilla/web-ext

v4.2.0

Compare Source

Bug Fixes

• web-ext run:
  • Fixed issue with Firefox >= 77 (#​1886) (b1b2804)
  • Disabled the default browser check for Chromium (#​1781) (eacb415)

Features

• web-ext run:

  • Added support for the Reference Browser to the firefox-android extension runner (#​1870) (#​1871) (e604112)
  • Disabled data reporting and “Choose what I share” notification by default (#​1883) (4af120f)

• web-ext lint: updated to use addons-linter v1.23.0:

  • Imported Firefox 73/74/75 APIs Schema
  • Improved mdn-browser-compat-data linting warning based on the details available about Firefox supported versions and flags associated with the API compatibility metadata (mozilla/addons-linter#​2944)
  • Support validating manifest CSP properties in v3 format (mozilla/addons-linter#​3053)
  • See all addons-linter changes: 1.20.0...1.23.0

See all changes: 4.1.0...4.2.0

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