Fix incompatibility with importlib-metadata 8

[JelleZijlstra]

Fixes #2974

Pull Request Checklist

• A news fragment is added in news/ describing what is new.
• Test cases added for changed code.

Describe what you have changed in this PR.

Still running the test suite locally to verify whether existing tests catch this.

[sydney-runkle]

Thanks for this fix!

I think this might also be related: https://github.com/pydantic/pydantic/actions/runs/9670225358/job/26678546379 (an issue with Home-Page from dist.metadata). Thoughts?

[frostming]

Please fix other occurrences as well, search for (regex) metadata\["[A-Z] to find them.

You will also need a compatibility helper function for this to not repeat the try-catch everywhere.

[sydney-runkle]

Thanks @JelleZijlstra, quite speedy 😎!

[JelleZijlstra]

Thanks, do you know if it is safe to assume that the "Name" key is always present? That's the one PDM looks at most frequently.

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.18%. Comparing base (7664d7b) to head (639e00a).
Report is 105 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pdm/utils.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2975      +/-   ##
==========================================
- Coverage   85.18%   85.18%   -0.01%     
==========================================
  Files         106      106              
  Lines       10735    10734       -1     
  Branches     2347     2347              
==========================================
- Hits         9145     9144       -1     
  Misses       1108     1108              
  Partials      482      482              

Flag	Coverage Δ
unittests	84.96% <91.66%> (-0.01%)	⬇️

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[JelleZijlstra]

Not sure what's causing the failure in 3.13 on Windows, but the same failure appeared on #2973, so it's probably not related to my changes.

[frostming]

Thanks