chore(package): update ember-uploader to version 1.2.3
chore(package): update ember-uploader to version 1.2.3

https://greenkeeper.io/
jrjohnson/frontend,ilios/frontend,thecoolestguy/frontend,ilios/frontend,gabycampagna/frontend,dartajax/frontend,djvoa12/frontend,thecoolestguy/frontend,dartajax/frontend,jrjohnson/frontend,gabycampagna/frontend,gboushey/frontend,gboushey/frontend,djvoa12/frontend