PRESUBMIT: drop python2 usage

We haven't used Python 2 in years.

BUG=None
TEST=CQ passes

Change-Id: I08924e67386a7a499c55a2ea90ebd6b2d7ac2caa
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/flashmap/+/4240702
Tested-by: Mike Frysinger <[email protected]>
Commit-Queue: Jack Rosenthal <[email protected]>
Auto-Submit: Mike Frysinger <[email protected]>
Reviewed-by: Jack Rosenthal <[email protected]>
1 file changed