Update dependency ember-intl to v5.6.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ember-intl (source)	5.5.1 -> 5.6.0

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Release Notes

ember-intl/ember-intl

### [`v5.6.0`](https://togithub.com/ember-intl/ember-intl/releases/v5.6.0) [Compare Source](https://togithub.com/ember-intl/ember-intl/compare/v5.5.1...v5.6.0) - chore(ci): temporarily disable `ember-canary` [`6623c0d`](https://togithub.com/ember-intl/ember-intl/commit/6623c0d) - fix: provide TS3 types ([#​1480](https://togithub.com/ember-intl/ember-intl/issues/1480)) [`4738925`](https://togithub.com/ember-intl/ember-intl/commit/4738925) - chore(ci): migrate GitHub Actions env ([#​1479](https://togithub.com/ember-intl/ember-intl/issues/1479)) [`36ff7c8`](https://togithub.com/ember-intl/ember-intl/commit/36ff7c8) - fix(deps): upgrade ember-cli-babel [`c75ff43`](https://togithub.com/ember-intl/ember-intl/commit/c75ff43) Fixes a potential import type parser error. - chore(deps): upgrade to `typescript@4` ([#​1442](https://togithub.com/ember-intl/ember-intl/issues/1442)) [`912c901`](https://togithub.com/ember-intl/ember-intl/commit/912c901) - feat(helpers): re-expose `-format-base` helper publicly ([#​1449](https://togithub.com/ember-intl/ember-intl/issues/1449)) [`e4a4563`](https://togithub.com/ember-intl/ember-intl/commit/e4a4563)

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