Update dependency ember-source to v4.8.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ember-source (source)	4.7.1 -> 4.8.0

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Release Notes

emberjs/ember.js

### [`v4.8.0`](https://togithub.com/emberjs/ember.js/blob/HEAD/CHANGELOG.md#v480-October-17-2022) [Compare Source](https://togithub.com/emberjs/ember.js/compare/v4.7.1...v4.8.0) - [#​20180](https://togithub.com/emberjs/ember.js/pull/20180) \[FEATURE] Publish an opt-in preview of public types for Ember - [#​20166](https://togithub.com/emberjs/ember.js/pull/20166) \[BUGFIX] Upgrade router_js to fix Linked list of RouteInfos contains undefined object

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