collections deprecation

[dbrw]

Please be wary of collections deprecation in python 3.9, I've been hit by this. I got the error using python 3.11:

❯ ./deploy.sh
Traceback (most recent call last):
  File "/home/dim/.local/bin/docker-sdp", line 4, in <module>
    deployer.main()
  File "/home/dim/.local/lib/python3.11/site-packages/docker_stack_deploy/cli/deployer.py", line 281, in main
    docker_stack_deploy()
  File "/home/dim/.local/lib/python3.11/site-packages/docker_stack_deploy/cli/deployer.py", line 204, in docker_stack_deploy
    augmented_services = augment_services(
                         ^^^^^^^^^^^^^^^^^
  File "/home/dim/.local/lib/python3.11/site-packages/docker_stack_deploy/cli/deployer.py", line 112, in augment_services
    if not isinstance(elem, collections.Mapping):
                            ^^^^^^^^^^^^^^^^^^^
AttributeError: module 'collections' has no attribute 'Mapping'

This is the deprecation page: https://docs.python.org/3.9/library/collections.html#module-collections

For now, I just change import collections to import collections.abc as collections in this line:

docker-stack-deploy/docker_stack_deploy/cli/deployer.py

Line 9 in 09a2d17

import collections

[s4ke]

should be in 0.2.11