Log Message:
py-tox: updated to 3.12.1

v3.12.1:

Bugfixes
- Ensure TOX_WORK_DIR is a native string in os.environ
- Fix import and usage of winreg for python2.7 on windows
- Fix Windows selects incorrect spec on first discovery

v3.12.0:

Bugfixes

- When using --parallel with --result-json the test results are now included the \ 
same way as with serial runs
- Turns out the output of the py -0p is not stable yet and varies depending on \ 
various edge cases. Instead now we read the interpreter values directly from \ 
registry via PEP-514

Features
- Adding TOX_PARALLEL_NO_SPINNER environment variable to disable the spinner in \ 
parallel mode for the purposes of clean output when using CI tools