Chris Bracken 8803824c64 Migrate all Python hashbangs to Python 3 (flutter/engine#27838)
Migrates all `#!/usr/bin/env python` hashbang lines to use python3.

Also updates the licence tool to treat python3 scripts on par with
python 2 scripts.

Issue: https://github.com/flutter/flutter/issues/83043
2021-07-31 11:09:12 -07:00
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