=== User Story
Keeping software up to date is part of maintaining it.
=== Testing Environment for QA
Maybe just a smoke test?
=== Acceptance Criteria
[] The skin.json schema version is now 2.
[] Changes needed _and_ wanted are identified and applied.
[] Benefits are applied opportunistically to other Web repos as wanted.
=== Dev notes
Docs and some recent patches to upgrade the extension.json version used in WikidataPageBanner and RelatedArticles:
https://www.mediawiki.org/wiki/Manual:Extension.json/Schema#Changes_in_manifest_version_2
https://phabricator.wikimedia.org/source/mediawiki/browse/master/docs/extension.schema.v2.json
https://gerrit.wikimedia.org/r/#/c/mediawiki/extensions/RelatedArticles/+/561997/
https://gerrit.wikimedia.org/r/#/c/mediawiki/extensions/WikidataPageBanner/+/562235/