Update to Ember 4.12.2

[simonihmig]

This updates the website to Ember 4.12.2, including:

• the app boilerplate and related dependencies by running ember-cli-update
• updated and deduped transitive deps (due to issues) by regenerating the lockfile (except for axe-core/a11y-testing, which seems to have breaking changes in a minor version update)
• ember-data to 4.12, including FastBoot fixes (https://github.com/emberjs/data/issues/8475)
• fix linting
• fix an issue with ember-data + prember (see inline comment)

Probably best reviewed by commit...

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[IgnaceMaes]

Thanks for this!

I wanted to look into upgrading as well and only then noticed you had made a PR already 🎉