* New upstream release from the beta channel (FIREFOX_62_0b20_BUILD1)
* Add patch from bmo: #1464766 to allow addon signature requirements
  to be relaxed
  - add debian/patches/allow-addon-signature-requirements-to-be-relaxed.patch
  - update debian/patches/series
* Lock extensions.unsignedScopes to 4 to disable the addon signing
  requirement for our language packs. This doesn't affect user installed
  addons
  - update debian/vendor-gre.js
* Drop upstreamed/obsolete patches
  - debian/patches/skia-big-endian.patch
* Add en-CA to debian/config/locales.shipped
* Update patches
  - update debian/patches/update-gn-mozbuild.patch