Replace deprecated pkg_resources usage in mongo observer

[pulkitgoyal56]

Summary

Prefer stdlib importlib.resources to locate sacred/data/mime.types and fall back to pkg_resources only if necessary. This avoids UserWarning about pkg_resources deprecation when importing sacred.observers.mongo.

./.venv/lib/python3.13/site-packages/sacred/dependencies.py:11: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.

This adds support for Python 3.13/14.

Rationale

pkg_resources is deprecated as an API; importlib.resources is the modern replacement in the stdlib and available in most supported Python versions.

This change is backwards-compatible and preserves previous behavior by falling back to pkg_resources when importlib.resources is not available.

Files Changed

sacred/observers/mongo.py

Testing

Smoke-tested import and mime detection locally.

Follow-up

Consider removing other uses of pkg_resources (e.g., sacred/dependencies.py).

[thequilo]

Hi @pulkitgoyal56! Thanks for addressing this issue! It seems like your modification is not backward-compatible, can you fix it for Python <=3.9?

Also, we use black formatting, please run the pre-commit hook. It will fix the test_pre_commit test case.

[pulkitgoyal56]

Hey, thanks for your reply. I'll fix it and apply the formatting.

[pulkitgoyal56]

I'd like to finish this issue, but keeping support for Python <= 3.9 is just hacky. Given that they have reached EOL, maybe this is not really required?

But if you still want to keep support for it, I'll cancel this pull request.