docs: Add general use citation from Julia in HEP paper

[matthewfeickert]

Description

Add general citation from Potential of the Julia programming language for high energy physics computing.

(Also congrats to the authors for getting this up on arXiv! I know it was a long process.)

Checklist Before Requesting Reviewer

• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

Before Merging

For the PR Assignees:

• Summarize commit messages into a comprehensive review of the PR

* Add general citation from 'Potential of the Julia programming
  language for high energy physics computing'.
   - c.f. https://inspirehep.net/literature/2666479

[matthewfeickert]

Relevant RTD build: https://pyhf--2231.org.readthedocs.build/en/2231/citations.html#general-citations

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (6bdc501) 98.30% compared to head (cb0d783) 98.30%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2231   +/-   ##
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  Coverage   98.30%   98.30%           
=======================================
  Files          69       69           
  Lines        4533     4533           
  Branches      802      802           
=======================================
  Hits         4456     4456           
  Misses         45       45           
  Partials       32       32           

Flag	Coverage Δ
contrib	97.88% <ø> (ø)
doctest	61.08% <ø> (ø)
unittests-3.10	96.31% <ø> (ø)
unittests-3.11	96.31% <ø> (ø)
unittests-3.8	96.33% <ø> (ø)
unittests-3.9	96.36% <ø> (ø)

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