chore(deps): update dependency ember-source to v3.28.12

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ember-source (source)	3.28.11 -> 3.28.12

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Release Notes

emberjs/ember.js (ember-source)

v3.28.12

Compare Source

• #​20388 [BUGFIX] Don't run getters while applying mixins

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