enable lint unnecessary_const (#682)
enable lint unnecessary_const (#682)


fluttercommunity/plus_plugins,fluttercommunity/plus_plugins,fluttercommunity/plus_plugins,fluttercommunity/plus_plugins,fluttercommunity/plus_plugins,fluttercommunity/plus_plugins,fluttercommunity/plus_plugins,fluttercommunity/plus_plugins,fluttercommunity/plus_plugins,fluttercommunity/plus_plugins,fluttercommunity/plus_plugins