[intl_translation] Upgrade to dart_style ^3.0.0

[Peetee06]

Is your feature request related to a problem? Please describe.
I'm trying to upgrade to freezed 3.0.0 and ran into an issue, because we are using lokalise_flutter_sdk, which dependens on intl_translation, which doesn't support dart_style 3.0.0.

Describe the solution you'd like
Update intl_translation to depend on dart_style 3.0.0.

Describe alternatives you've considered
The only workaround I see is using dependency_overrides.

I prepared the update already locally, but it builds on top of #970, so I'm waiting for that to be merged before opening the PR.

[Peetee06]

This is now part of #970, because the update of analyzer required to also update dart_style.