docs: Add use citation from vector-like leptons at a muon collider paper

[matthewfeickert]

Description

Add use citation from Search for vector-like leptons at a Muon Collider by Qilong Guo, Leyun Gao, Yajun Mao, Qiang Li.

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• 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

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For the PR Assignees:

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* Add use citation from 'Search for vector-like leptons at a Muon Collider'.
   - c.f. https://inspirehep.net/literature/2648832

[matthewfeickert]

Relevant RTD build: https://pyhf--2160.org.readthedocs.build/en/2160/citations.html

[matthewfeickert]

I'm going to approve and merge this myself. As always, PRs approved by a single core dev can be reverted as needed by the rest of the dev team.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +1.94 🎉

Comparison is base (b738927) 96.35% compared to head (bdb55e4) 98.30%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2160      +/-   ##
==========================================
+ Coverage   96.35%   98.30%   +1.94%     
==========================================
  Files          69       69              
  Lines        4531     4531              
  Branches      608      800     +192     
==========================================
+ Hits         4366     4454      +88     
+ Misses        126       45      -81     
+ Partials       39       32       -7     

Flag	Coverage Δ
contrib	97.88% <ø> (?)
doctest	61.15% <ø> (?)
unittests-3.10	96.31% <ø> (?)
unittests-3.11	96.31% <ø> (?)
unittests-3.8	96.33% <ø> (?)
unittests-3.9	96.35% <ø> (ø)

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see 10 files with indirect coverage changes

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