py-werkzeug@:0.12 does not work with python@3.10:
Test with py-werkzeug 0.12.2 and python 3.10:
```
$ python3.10 -c 'import werkzeug'
py-werkzeug-0.12.2/lib/python3.11/site-packages/werkzeug/datastructures.py", line 16, in <module>
from collections import Container, Iterable, MutableSet
ImportError: cannot import name 'Container' from 'collections'
```
Test with py-werkzeug 0.12.2 and python 3.9:
```
python3.9 -c "from collections import Container"
<string>:1: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3, and in 3.10 it will stop working
```
db5d0ac6ac