chore: remove unused ember-cached-decorator-polyfill

[simonihmig]

We don't need this, as we are already on an Ember version that supports @cached natively (>= 4.1).

This will also fix running into CrowdStrike/ember-headless-form#146 for the docs-app.

[changeset-bot]

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Latest commit: 48548f8

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[ynotdraw]

Thank you!

[simonihmig]

Hm, publishing the docs failed to cloudflare failed with an auth error. I though this would only happen for external contributors (as secrets are not available in workflow runs)... 🤔