firebase_ui_auth: widen app_links constraint to allow ^7.0.0

[bjrochem72]

firebase_ui_auth 3.1.0 pins app_links: ^6.4.0. app_links 7.x has been out for a while (currently 7.2.1) and includes the UIScene lifecycle adoption, so any app using firebase_ui_auth is held on 6.4.1 and gets this on every iOS launch:

Plugin AppLinksIosPlugin uses deprecated application lifecycle events. Please contact plugin maintainers and request UIScene lifecycle support. This will be required in a future version of Flutter.

Flutter has said these warnings will become errors in a future release, so this will eventually break builds rather than just being noise.

From the app_links changelog the 6 to 7 bump looks small on the consuming side. Would you accept a PR widening the constraint to ">=6.4.0 <8.0.0" (or straight ^7.0.0) if the API usage in firebase_ui_auth is compatible?

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[bjrochem72]

Still relevant as of 2026-08-30. firebase_ui_auth 3.1.0 (latest) still pins app_links: ^6.4.0, so consuming apps stay on 6.4.x and hit the deprecated UIScene lifecycle warning on every iOS launch. app_links is now at 7.x with UIScene lifecycle support.

There is already an open one-line fix for this: PR #676 widens the constraint to ">=6.4.0 <8.0.0". It is CLA-cleared and mergeable, and its own tests pass (the only red jobs are the pre-existing e2e failures that are also red on main). @russellwheatley any chance of a review? Happy to rebase or adjust if anything is needed.