v421

Merge pull request #3597 from alphagov/dependabot/bundler/govuk_app_c…

v420

Merge pull request #3596 from alphagov/dependabot/bundler/govuk_web_b…

v419

Merge pull request #3595 from alphagov/dependabot/bundler/gds-api-ada…

v418

Merge pull request #3598 from alphagov/govuk-chat-banner-on-search

Add a GOV.UK Chat banner to search results

v417

Merge pull request #3594 from alphagov/dependabot/bundler/rubocop-gov…

v416

Merge pull request #3593 from alphagov/dependabot/bundler/govuk_publi…

v415

Merge pull request #3591 from alphagov/dependabot/npm_and_yarn/jasmin…

v414

Merge pull request #3590 from alphagov/dependabot/bundler/gds-api-ada…

v413

Merge pull request #3589 from alphagov/dependabot/bundler/govuk_app_c…

v412

Merge pull request #3592 from alphagov/add-govuk_web_banners-gem

Add govuk_web_banners gem