Update dependency ember-source to v4.7.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ember-source (source)	4.6.0 -> 4.7.0

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Release Notes

emberjs/ember.js

### [`v4.7.0`](https://togithub.com/emberjs/ember.js/blob/HEAD/CHANGELOG.md#v470-September-6-2022) [Compare Source](https://togithub.com/emberjs/ember.js/compare/v4.6.0...v4.7.0) - [#​20126](https://togithub.com/emberjs/ember.js/pull/20126) \[BUGFIX] Replace Firefox detection that used a deprecated browser API

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