Remove deprecated call to pkg_resources

[jfoster17]

Remove explicit calls to pkg_resources

Description

Sort of following the process in glue-viz/glue#2365, this updates echo to not depend on the deprecated pkg_resources API, at the cost of requiring importlib_metadata for older versions of Python (but glue installations will have this dependency anyway with the above-referenced change).

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.09% 🎉

Comparison is base (ab38456) 96.65% compared to head (133a262) 96.74%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #36      +/-   ##
==========================================
+ Coverage   96.65%   96.74%   +0.09%     
==========================================
  Files          17       17              
  Lines        2182     2182              
==========================================
+ Hits         2109     2111       +2     
+ Misses         73       71       -2     

Files Changed	Coverage Δ
echo/version.py	100.00% <100.00%> (+33.33%)	⬆️

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[jfoster17]

I'm not sure exactly what's going on what that remaining test failure.

[dhomeier]

OSError: [WinError 123] The filename, directory name, or volume label syntax is incorrect: '--cov-report=xml:D:\a\echo\echo\coverage.xml'

I recall seeing that elsewhere with an older Windows env, obviously messing up the volume label in the default --cov-report=xml:{toxinidir}/coverage.xml or whatever it is; don't remember how that was fixed though (other than retiring Python 3.7 at least for the Windows test perhaps) – pyqt510 is quite old...

[astrofrog]

Thanks! We've already dropped Python 3.7 for glue-core so I think we can just require >=3.8 here now?

[dhomeier]

Was wondering if it was required for pyqt510, but 5.10.1 seems to have wheels for 3.8 already.

[jfoster17]

Was wondering if it was required for pyqt510, but 5.10.1 seems to have wheels for 3.8 already.

Looks like I pushed just as you were commenting here. I removed the py37 tests, but do you want one back for pyqt510? The main glue package requires >=5.14, so we could just drop some older versions...

[dhomeier]

Was just wondering if there was a specific reason to test the older versions here, but otherwise yes, keeping them in sync with glue-core (which underwent a major cleanup last year) probably makes sense.

[astrofrog]

Keeping in sync with glue-core is fine!

[dhomeier]

Added some suggestions for py311 test envs, will still need to be added to tox.ini – @jfoster17 we should re-run the CI with these, and then this should finally be ready to go.

[dhomeier]

Thanks, everything looking great! I will probably squash for the merge.

[jfoster17]

Okay, please do squash.

[dhomeier]

Alternatively, if you could squash just the last 4 commits into one and force-push, should be good as well. But either way is fine.