docs: Add use citation from dark matter at muon colliders paper

[matthewfeickert]

Description

Add use citation from Boosting dark matter searches at muon colliders with Machine Learning: the mono-Higgs channel as a case study.

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* Add use citation from 'Boosting dark matter searches at muon colliders
  with Machine Learning: the mono-Higgs channel as a case study'.
   - c.f. https://inspirehep.net/literature/2700441

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (ae29d4b) 98.28% compared to head (a5eccd9) 98.28%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2341   +/-   ##
=======================================
  Coverage   98.28%   98.28%           
=======================================
  Files          69       69           
  Lines        4538     4538           
  Branches      803      803           
=======================================
  Hits         4460     4460           
  Misses         45       45           
  Partials       33       33           

Flag	Coverage Δ
contrib	97.86% <ø> (ø)
doctest	60.99% <ø> (ø)
unittests-3.10	96.29% <ø> (ø)
unittests-3.11	96.29% <ø> (ø)
unittests-3.8	96.31% <ø> (ø)
unittests-3.9	96.34% <ø> (ø)

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[matthewfeickert]

Relevant RTD build: https://pyhf--2341.org.readthedocs.build/en/2341/citations.html#use-citations