[lint] replace autopep8 with black (contrib/devtools)

Summary:
See D13876 for more background on black.

Depends on D13891

Test Plan:
gitian builds (for security-check.py and symbol-check.py)
arc lint --everything

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D13892