Replace logger.warn w/ logger.warning

[zklaus]

Description

This replaces calls to logger.warn with logger.warning. The former has been deprecated since Python 3.3 and generates DeprecationWarnings that can make output particularly in debugging and testing more noisy than necessary.

Also see conda/conda#13963.

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[maresb]

Thanks @zklaus!

Most of the changes are on vendored code, so that should not be changed outside of revendoring or specific patches.

The changes to conda_lock/conda_solver.py look good though! Would you be able to rebase with just this? Thanks!

[zklaus]

Thanks for the quick feedback, @maresb! I did put those changes into a separate commit because I expected this discussion :) The changes in vendored code are all in conda. The corresponding PR for conda is conda/conda#13963.

What's the procedure for revendoring here?

[maresb]

Roughly the procedure is

1. Install vendoring
2. Update vendor.txt to update the version
3. Run vendoring update
4. Fix breakage

Now may actually be a good time to revendor since we can do it concurrently with #637. Thanks for your interest in this @zklaus!

[zklaus]

Hm. If we are doing this, it may be best to wait for a release of conda that includes the fixes, so how about this:

1. I'll remove the changes to the vendored code here
2. We merge this PR and consider it enough to unblock Replace logger.warn w/ logger.warning conda#13963
3. We merge Replace logger.warn w/ logger.warning conda#13963
4. Wait for the next conda release
5. Revendor to that version
6. Profit

[maresb]

perfect, thanks @zklaus!!!