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This commit makes extract_actions.py and its dependencies compatible
with Python 3.8+.

extract_actions.py and its dependencies are still Python 2
compatible.

Bug: 941669
Change-Id: I4038e49449ef0cda8e7801ea49aef7e80a53c9bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2531120
Commit-Queue: Dirk Pranke <dpranke@google.com>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#827107}