Flutter: [Breaking Change] Deprecations expiring after v2.2 release

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A new Flutter blog post/announcement has been posted!

Hello everyone, With a new release comes a new batch of deprecations that have reached end of life. Please see flutter.dev/go/deprecations-removed-after-2-2 for the next set of APIs that are scheduled to be removed before the next stable release in accordance with our Deprecation Policy. I am

Get the full details here: https://groups.google.com/d/msg/flutter-announce/wSyaQWLuVN8/-8dx9nIZAgAJ

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