docs: Update citations references with journal pubs through 2023-12

[matthewfeickert]

Description

• Add use citation from Search for a Heavy Neutrino in \ensuremath{\tau} Decays at Belle.

• Add use citation from Probing electroweak phase transition in the singlet
  Standard Model via bbγγ and 4l channels.

• Update use citations references to include their journal publication information.

  • SModelS v2.3: enabling global likelihood analyses.

  • Boosting dark matter searches at muon colliders with machine
    learning: The mono-Higgs channel as a case study

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 use citation from 'Search for a Heavy Neutrino in \ensuremath{\tau}
  Decays at Belle'.
   - c.f. https://inspirehep.net/literature/2616299

* Add use citation from 'Probing electroweak phase transition in the singlet
  Standard Model via bbγγ and 4l channels'.
   - c.f. https://inspirehep.net/literature/2639009

* Update use citations references to include their journal publication information.

   - 'SModelS v2.3: enabling global likelihood analyses'.
     https://doi.org/10.21468/SciPostPhys.15.5.185

   - 'Boosting dark matter searches at muon colliders with machine
     learning: The mono-Higgs channel as a case study'.
     https://doi.org/10.1093/ptep/ptad144

[matthewfeickert]

Relevant RTD build: https://pyhf--2418.org.readthedocs.build/en/2418/citations.html#use-citations

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4ec2cc2) 98.28% compared to head (9d61849) 98.28%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2418   +/-   ##
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  Coverage   98.28%   98.28%           
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  Files          69       69           
  Lines        4539     4539           
  Branches      803      803           
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  Hits         4461     4461           
  Misses         45       45           
  Partials       33       33           

Flag	Coverage Δ
contrib	97.86% <ø> (ø)
doctest	60.71% <ø> (ø)
unittests-3.10	96.29% <ø> (ø)
unittests-3.11	96.29% <ø> (ø)
unittests-3.8	96.32% <ø> (ø)
unittests-3.9	96.34% <ø> (ø)

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