[Snyk] Upgrade ember-source from 3.8.3 to 3.28.4#16

snyk-bot wants to merge 1 commit intomasterhixio-mh/ember-cli-fastboot:masterfrom

snyk-upgrade-c590c387a61b4dc8c7d7b9a983c3d15chixio-mh/ember-cli-fastboot:snyk-upgrade-c590c387a61b4dc8c7d7b9a983c3d15cCopy head branch name to clipboard