Upgrade ember-app-scheduler to the latest

[SergeAstapov]

Allow consumer apps to use latest ember-app-scheduler.

Release notes: https://github.com/ember-app-scheduler/ember-app-scheduler/releases/tag/v6.0.0

[snewcomer]

Thank yoU!!

[Turbo87]

isn't this a breaking change for users that use a different/conflicting version?

[SergeAstapov]

@Turbo87 considering the only breaking change in [email protected] - removed some deprecated APIs which are not used by ember-router-scroll, I would say no.

However this may become extra work for those who use both ember-app-scheduler and ember-router-scroll without package lock/yarn lock in case if app is not ready for [email protected]. then ember-router-scroll needs to use ~4.0.0 in package.json (to avoid issues described in https://github.com/salsify/ember-cli-dependency-lint#motivation).

it may be safer (in my opinion) to release as major version bump just to avoid potential issues for apps that use both ember-app-scheduler and ember-router-scroll without ember-cli-dependency-lint integrated with CI.

[Turbo87]

I think the safe thing to do is something like "ember-app-scheduler": "^5.1.2 || ^6.0.0". That way you can let the user decide which version he wants to have.

[SergeAstapov]

@Turbo87 great suggestion! Created #284.

@snewcomer do you mind to release #284 as 4.1.1?