Azure pipelines CI failing on macOS

[davidgyu]

As mentioned in #1329 CI builds are currently failing on macOS because of changes to the config of the Microsoft hosted agent.

We've fixed a similar issue in the OpenUSD build script and can apply a similar fix here.

We might also take this opportunity to update to the macOS-12 vmImage from the currently specified macOS-11 vmImage.

/bin/bash --noprofile --norc /Users/runner/work/_temp/4a641c5b-5932-47b6-9975-7d6d26e3535f.sh
/Users/runner/work/1/s/build_scripts/build_osd.py:122: SyntaxWarning: invalid escape sequence '\d'
  "(\d+).(\d+)",
Traceback (most recent call last):
  File "/Users/runner/work/1/s/build_scripts/build_osd.py", line 26, in <module>
    from distutils.spawn import find_executable
ModuleNotFoundError: No module named 'distutils'

[davidgyu]

Filed as internal issue #OSD-437