python-modernize, format and some manual lint fixes No-Try: True Bug: None Change-Id: I89d9f97f238be887962c67e18cc6480a8f6f3ac4 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/264551 Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org> Cr-Commit-Position: refs/heads/main@{#37071}