Revert "Roll Dart version to f9ebf2129732fd2b606286fdf58e500384b8a0bc… #6820
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… (#6812)"
This reverts commit 2584816.
Breaks flutter_gallery_ios32__transition_perf devicelab test upstream in flutter (previous commit works). Stack trace:
Will land TBR @a-siva
/cc @amirh