docs(backport): Update citations references with journal pubs through 2023-10

[matthewfeickert]

Description

Backport PR #2367

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• Tests are passing
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* Backport PR https://github.com/scikit-hep/pyhf/pull/2367
* Update use citations references to include their journal publication information.

   - 'Vector-like lepton searches at a muon collider in the context of
     the 4321 model*'.
     https://doi.org/10.1088/1674-1137/ace5a7

   - 'Potential of the Julia Programming Language for High Energy
     Physics Computing'.
     https://doi.org/10.1007/s41781-023-00104-x

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

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##             release/v0.7.x    #2368   +/-   ##
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  Hits                      ?     4318           
  Misses                    ?      129           
  Partials                  ?       40           

Flag	Coverage Δ
unittests-3.7	96.23% <0.00%> (?)

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