This was going to break in Python 3.8, but it seems there was a push back and now it is 3.9, so I guess they really really mean it now.
.tox\py-dns1_15-noapsw\lib\site-packages\stash\core\modules\base.py:5
c:\users\containeradministrator\appdata\local\temp\cirrus-ci-build\.tox\py-dns1_15-noapsw\lib\site-packages\stash\core\modules\base.py:5: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3, and in 3.9 it will stop working
from collections import MutableMapping
.tox\py-dns1_15-noapsw\lib\site-packages\stash\archives\a_apsw.py:4
c:\users\containeradministrator\appdata\local\temp\cirrus-ci-build\.tox\py-dns1_15-noapsw\lib\site-packages\stash\archives\a_apsw.py:4: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3, and in 3.9 it will stop working
from collections import Mapping