Add inputs section in GHA workflow example

[christolis]

Not sure whether the inputs section is needed in the GHA workflow but when trying to use it, I get this:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.05%. Comparing base (538c420) to head (813e7f5).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #242      +/-   ##
==========================================
+ Coverage   93.99%   94.05%   +0.05%     
==========================================
  Files          26       26              
  Lines        1716     1716              
  Branches      331      232      -99     
==========================================
+ Hits         1613     1614       +1     
  Misses         75       75              
+ Partials       28       27       -1     

Flag	Coverage Δ
python-3.10	94.05% <ø> (+0.05%)	⬆️
python-3.11	94.05% <ø> (+0.05%)	⬆️
python-3.8	93.91% <ø> (ø)
python-3.9	93.97% <ø> (+0.05%)	⬆️

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