drop use of deprecated pkg_resources

[graingert]

re: #507

[codecov]

Codecov Report

Patch coverage: 82.22% and project coverage change: +0.31 🎉

Comparison is base (fb33195) 68.35% compared to head (df143c4) 68.67%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #508      +/-   ##
==========================================
+ Coverage   68.35%   68.67%   +0.31%     
==========================================
  Files          12       12              
  Lines         929      964      +35     
==========================================
+ Hits          635      662      +27     
- Misses        294      302       +8     

Impacted Files	Coverage Δ
src/wheel/bdist_wheel.py	51.90% <45.45%> (-0.94%)	⬇️
src/wheel/metadata.py	96.66% <94.11%> (-1.73%)	⬇️

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[graingert]

ah annoyingly this fails on python 3.7 due to the missing importlib.metadata and vendoring importlib_metadata is a bit of a pain as it needs zipp and typing_extensions

there's only 3 months and 2 weeks left of python 3.7 support can it be dropped?

[graingert]

actually I can do this with setuptools.__version__ instead of importlib.metadata.distribution("setuptools").version because setuptools is already imported in bdist_wheel.py

[agronholm]

Are all of those packaging modules needed?

[graingert]

Yeah I manually copied across the files imported by requirements.py https://github.com/pypa/wheel/pull/508/files#diff-3f63151da655b90d5d7ec0932887c5a073679a0917dfe94a9617a4e2806ae9caR8 and version.py https://github.com/pypa/wheel/pull/508/files#diff-4ca355345b43bff399508dc8133341267a5aa2bde8035345495d759d0df4c247R15

[agronholm]

Looks good.

[agronholm]

Oh, one more thing: could you add a line to the changelog? I will merge then.

[graingert]

@agronholm done

[agronholm]

Thanks!