gh-103624: avoid DeprecationWarning when getting package metadata in pydoc

[dlax]

• Issue: pydoc emits deprecation warnings about package metadata #103624

[ghost]

All commit authors signed the Contributor License Agreement.

[dlax]

I can apply the same logic for other metadata, e.g. __author__, if the approach here sounds good.

I didn't find a way to test this, in Lib/test/test_pydoc.py, with the current infrastructure as it would require a dist package or so.

[FFY00]

Thank you for the contribution! As mentioned, I think the current implementation is problematic, and I don't really have a good solution for that.

IMO suppressing DeprecationWarning on the attribute access would be a reasonable resolution for this issue, even if not super nice.

[dlax]

I have made the requested changes; please review again.