Update dependency ember-cli to v4.12.3

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ember-cli (source)	4.12.1 -> 4.12.3

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Release Notes

ember-cli/ember-cli (ember-cli)

v4.12.3

Compare Source

Blueprint Changes

• ember new diff
• ember addon diff

Changelog

• #​10458 Use Lodash's _.template instead of lodash.template package @​gorner

Thank you to all who took the time to contribute!

v4.12.2: Release 4.12.2

Compare Source

Blueprint Changes

• ember new diff
• ember addon diff

Changelog

• #​10314 [BUGFIX] Do not try to wire up Testem unless a test framework is dete… @​NullVoxPopuli

Thank you to all who took the time to contribute!

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