Pinning doc dependencies to reflect rtd-theme constraints

[lpascal-ledger]

No description provided.

[niooss-ledger]

I confirm this fixed:

cd docs
uv run --no-project --with-requirements requirements.txt make html

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.91%. Comparing base (fa8e4e6) to head (5d8a574).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #518   +/-   ##
=======================================
  Coverage   44.91%   44.91%           
=======================================
  Files         120      120           
  Lines       12067    12067           
  Branches      966      966           
=======================================
  Hits         5420     5420           
  Misses       6312     6312           
  Partials      335      335           

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