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Use `curly_braces_in_flow_control_structures ` for sample code (#104617)

* use `flutter_lints` for sample code

* update packages

* Revert "update packages"

This reverts commit 14da3c69a8da9a093ad9c2acd3fc5d6c7f7751ed.

* revert
P
Pierre-Louis committed
308b543783dd3d8b9eef8b8e9b3c9516a8a4462f
Parent: 332c22f
Committed by GitHub <noreply@github.com> on 5/26/2022, 6:59:37 AM