Update dependency ember-intl to v6.5.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ember-intl (source)	6.4.1 -> 6.5.1

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Release Notes

ember-intl/ember-intl (ember-intl)

v6.5.1: Documented how to provide translations in apps, v1 addons, and v2 addons

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In the docs folder, I created 3 additional projects so that there's a living documentation (tested in CI) of how apps, v1 addons, and v2 addons can provide translations.

I also updated the documentation site. You will find new content in:

• Getting Started > Overview
• Getting Started > Quickstart (Apps)
• Getting Started > Quickstart (Addons)

v6.5.0: Refactored intl service and private utilities

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[!WARNING]
To lower the maintenance cost, I removed code that should be unused, and refactored code that should be private.

While existing tests continued to pass, it's possible that one of the refactors is a soft breaking change for your project (e.g. because you overwrote a method from the intl service). To be safe, I went with a minor release.

If you find a regression, please open an issue and provide me context, so that we can see if a revert is needed.

Thanks to @​bertdeblock for fixing a URL typo in the blueprints.

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