chore(deps): update dependency ember-source to ~4.12.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ember-source (source)	~4.10.0 -> ~4.12.0

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Release Notes

emberjs/ember.js (ember-source)

v4.12.4

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• #​20595 [BUGFIX] Blueprints: An addon re-export should always be a JavaScript file

v4.12.3

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• #​20493 [BUGFIX] Backport more types fixes

v4.12.2

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• #​20481 [BUGFIX] Backport some stable type import locations

v4.12.1

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• #​20461 [BUGFIX] Fix cyclic module crash with engines and fastboot.

v4.12.0

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• #​20352 [FEATURE] Enable generating Typescript blueprints when isTypeScriptProject is true without additional environment variables per RFC #​800.
• #​20355 [FEATURE] Enhance the Typescript blueprint for generated services per RFC #​800.
• #​20356 [FEATURE] Generate signature in Typescript component blueprints per RFC #​800.
• #​20388 [BUGFIX] Don't run getters while applying mixins
• #​20398 [BUGFIX] Fix runloop types on TS 5.0+
• #​20385 [BUGFIX] Improve error for owner methods called after destroy

v4.11.0

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• #​20288 [FEATURE] Stable types for @ember/owner
• #​20323 [FEATURE] Introduce stable types for @ember/error
• #​20361 [BUGFIX] Support a router.ts file when generating routes
• #​20373 / #​20374 [BUGFIX] Make the type for SafeString public
• #​20345 [CLEANUP] Remove flags for released features
• #​20285 Update to TS v4.9

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