Revert "Bump sphinx from 7.4.7 to 8.1.3"

[davidorme]

Reverts #610

Still need to get dependabot to leave sphinx alone. I've now got develop and main to require docs_build to pass

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.18%. Comparing base (e690579) to head (d9884c5).
Report is 8 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #611      +/-   ##
===========================================
- Coverage    95.25%   95.18%   -0.07%     
===========================================
  Files           74       74              
  Lines         4380     4380              
===========================================
- Hits          4172     4169       -3     
- Misses         208      211       +3     

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