Use log.warning instead of the deprecated warn

[sed-i]

Description

Every integration test currently ends with a warning:

tests/integration/test_bundle.py::test_loki_receives_logs
  /home/ubuntu/code/o11y/cos-lite-bundle/.tox/integration/lib/python3.10/site-packages/juju/model.py:1513: DeprecationWarning: The 'warn' method is deprecated, use 'warning' instead
    log.warn("relate is deprecated and will be removed. Use integrate instead.")

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html

Fixes:

• Use warning instead of warn.

QA Steps

Run any integration test that includes a relate call and make sure the warning is gone from the summary.

[jujubot]

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@hpidcock @anvial

[jujubot]

Thanks for opening a pull request! Please follow the instructions here to ensure your pull request is ready for review. Then, a maintainer will review your patch.

@hpidcock @anvial

[sed-i]

I realize that the warn is probably used intentionally so the warning isn't swallowed, but do we really need this warning? Why can't relate remain an alias for integrate?

[cderici]

Thanks Leon, I was planning on doing a cleaning sweep for all these warnings etc in pylibjuju. Got a couple more of these to clean up, it's on my list.

Why can't relate remain an alias for integrate?

That would be a general Juju design question. I'm not familiar with the discussions for this particular name change. @jameinel might have some answers for you.

[cderici]

/build

[cderici]

/merge