Pin swagger-cli to 2.2.1
Pin swagger-cli to 2.2.1

Keep CI happy

Change-Id: I366941a90d33322f13110e6bb6e396e3f61f8cfc

wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps