composerinstall.yaml: add UrlShortener
Created by: MusikAnimal
UrlShortener will soon have composer dependencies, i.e. https://gerrit.wikimedia.org/r/c/mediawiki/extensions/UrlShortener/+/930716
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Created by: MusikAnimal
UrlShortener will soon have composer dependencies, i.e. https://gerrit.wikimedia.org/r/c/mediawiki/extensions/UrlShortener/+/930716