tree cd23c56913d8a36f09ab2dc5c4722bd02e3be131
parent c29083d1790e28a9a92a37c0a8cc0feae563f880
author stuartmorgan <stuartmorgan@google.com> 1650037354 -0400
committer GitHub <noreply@github.com> 1650037354 -0700
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[pigeon] Remove support for non-NNBD (#1524)

Makes a breaking change to remove non-NNBD support, since it adds complexity
to the generator and there's no compelling reason to continue supporting it going
forward.

Also updates some legacy Dart commands in scripts (dartanalyzer, dart pub run)
to their modern versions.