Fix: Undefined name 'awaitNotRequired' from material_ui or cupertino_ui on Flutter 3.44
material_ui 1.3.0 and cupertino_ui 1.1.0 use an annotation Flutter 3.44 does not export. Both are retracted, but a lockfile keeps them. Downgrade, then upgrade, to land on 1.2.0 and 1.0.2.