Remove extra pkg_resource use

[IAlibay]

Towards Python 3.12

Changes made in this Pull Request:

• Remove an extra pkg_resource use that we hadn't previously noticed.

PR Checklist

• Tests?

Developers certificate of origin

• I certify that this contribution is covered by the LGPLv2.1+ license as defined in our LICENSE and adheres to the Developer Certificate of Origin.

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📚 Documentation preview 📚: https://mdanalysis--4294.org.readthedocs.build/en/4294/

[github-actions]

Linter Bot Results:

Hi @IAlibay! Thanks for making this PR. We linted your code and found the following:

Some issues were found with the formatting of your code.

Code Location	Outcome
main package	⚠️ Possible failure
testsuite	✅ Passed

Please have a look at the darker-main-code and darker-test-code steps here for more details: https://github.com/MDAnalysis/mdanalysis/actions/runs/6245517481/job/16954309038

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Please note: The black linter is purely informational, you can safely ignore these outcomes if there are no flake8 failures!

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (10b09c9) 93.40% compared to head (0820fa0) 93.40%.

Additional details and impacted files

@@            Coverage Diff             @@
##           develop    #4294     +/-   ##
==========================================
  Coverage    93.40%   93.40%             
==========================================
  Files          170      184     +14     
  Lines        22256    23365   +1109     
  Branches      4071     4071             
==========================================
+ Hits         20789    21825   +1036     
- Misses         951     1024     +73     
  Partials       516      516             

Files Changed	Coverage Δ
package/MDAnalysis/analysis/data/filenames.py	100.00% <100.00%> (ø)

... and 14 files with indirect coverage changes

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