update some pipeline images (macos-12, ubuntu20), fix pycodestyle E275 #672
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macos-10.15 will soon be deprecated in GitHub Actions and Azure Devops so we are upgrading the version of macOS that we use.
Relevant issue:
actions/runner-images#5583
Additionally updating the deprecated ubuntu 18 image to ubuntu 20.
Fixing multiple new E275 style errors with new pycodestyle update.