docs: Update citations references to include journal pubs through 2023-04

[matthewfeickert]

Description

• 'Simplified likelihoods using linearized systematic uncertainties' is published as JHEP 04 (2023) 084. https://doi.org/10.1007/JHEP04(2023)084
• 'HighPT: A tool for high-pT Drell-Yan tails beyond the standard model' is published as Comput.Phys.Commun. 289 (2023) 108749. https://doi.org/10.1016/j.cpc.2023.108749

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

* Update use citations references to include their journal
  publication information.
   - 'Simplified likelihoods using linearized systematic uncertainties'
     is published as JHEP 04 (2023) 084.
     https://doi.org/10.1007/JHEP04(2023)084
   - 'HighPT: A tool for high-pT Drell-Yan tails beyond the standard
     model' is published as Comput.Phys.Commun. 289 (2023) 108749.
     https://doi.org/10.1016/j.cpc.2023.108749

[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 and project coverage have no change.

Comparison is base (b031bb9) 98.30% compared to head (84ea3b1) 98.30%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2201   +/-   ##
=======================================
  Coverage   98.30%   98.30%           
=======================================
  Files          69       69           
  Lines        4533     4533           
  Branches      801      801           
=======================================
  Hits         4456     4456           
  Misses         45       45           
  Partials       32       32           

Flag	Coverage Δ
contrib	97.88% <ø> (ø)
doctest	61.12% <ø> (ø)
unittests-3.10	96.31% <ø> (ø)
unittests-3.11	96.31% <ø> (ø)
unittests-3.8	96.33% <ø> (ø)
unittests-3.9	96.36% <ø> (ø)

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