docs: Add use citation from H->aa ATLAS CONF note

[matthewfeickert]

Description

Add use citation from 'Search for short- and long-lived axion-like particles in H → a a → 4 γ decays with the ATLAS experiment at the LHC'

• c.f. https://inspirehep.net/literature/2691210
• http://cds.cern.ch/record/2867933
• ATLAS-CONF-2023-040

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 short- and long-lived axion-like particles
  in H → a a → 4 γ decays with the ATLAS experiment at the LHC'.
   - https://inspirehep.net/literature/2691210
   - http://cds.cern.ch/record/2867933
   - ATLAS-CONF-2023-040

[matthewfeickert]

Relevant RTD build: https://pyhf--2306.org.readthedocs.build/en/2306/citations.html#use-citations

We haven't had a use citation form a CONF note that I know of yet(?), or if we have it has gotten updated into a publication and then removed, so @kratsg let me know if you find this BibTeX format acceptable.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (205eecf) 98.30% compared to head (cc6b151) 98.30%.

❗ Current head cc6b151 differs from pull request most recent head ac2897d. Consider uploading reports for the commit ac2897d to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2306   +/-   ##
=======================================
  Coverage   98.30%   98.30%           
=======================================
  Files          69       69           
  Lines        4536     4536           
  Branches      802      802           
=======================================
  Hits         4459     4459           
  Misses         45       45           
  Partials       32       32           

Flag	Coverage Δ
contrib	97.88% <ø> (ø)
doctest	61.04% <ø> (ø)
unittests-3.10	96.31% <ø> (ø)
unittests-3.11	96.31% <ø> (ø)
unittests-3.8	96.34% <ø> (ø)
unittests-3.9	96.36% <ø> (ø)

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[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.