Bump engine.io, ember-cli and ember-data in /frontend#4

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dependabot/npm_and_yarn/frontend/engine.io-and-ember-cli-and-ember-data-3.6.1jcmundy/embertestapp:dependabot/npm_and_yarn/frontend/engine.io-and-ember-cli-and-ember-data-3.6.1Copy head branch name to clipboard