Bower has changed their registry URL some time ago and has now announced to deprecate the old URL. Old registry will be disabled next Wednesday. In order for your work not to be affected make sure to update your composer asset plugin to the latest version:
We are happy to announce the release of the first official stable version of the Yii 2 Queue Extension. Roman Zhuravlev took care of rewriting and polishing the queue extension after core team and community made initial prototypes. His work had been released as a zhuravlev/yii2-queue package before and proved to be of good quality. Together we've decided to move the package under the yiisoft organization so it gets more attention and support. Roman agreed to maintain it further together with current Yii team.