Dart CI

`dart pub upgrade --major-versions --tighten` #2336

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Run time

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Job	Run time
dart_analyze	17s
dart_format	14s
dart_docs	32s
dart_test (ubuntu-latest)	1m 3s
dart_test (windows-latest)	1m 5s
dart_test (macos-latest)	1m 11s
dart_pana	58s
dart_publish_dry_run	17s
	5m 37s