chore: Update docs/requirements.txt

[robtaylor]

as generated by make docs/requirements.txt

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.55%. Comparing base (73032f7) to head (0b79767).
Report is 6 commits behind head on develop.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #680      +/-   ##
===========================================
+ Coverage    96.53%   96.55%   +0.02%     
===========================================
  Files           40       40              
  Lines         5196     5198       +2     
  Branches       973     1223     +250     
===========================================
+ Hits          5016     5019       +3     
  Misses         106      106              
+ Partials        74       73       -1     

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