Silent pybind11 warning

[rhaschke]

On Jammy, pybind11 complains with:

CMake Warning at python/pybind11/tools/pybind11Tools.cmake:24 (message):
  Set PYBIND11_PYTHON_VERSION to search for a specific version, not
  PYTHON_VERSION (which is an output).  Assuming that is what you meant to do
  and continuing anyway.

Looks like PYTHON_VERSION_STRING is not defined anymore.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.90%. Comparing base (1acf72e) to head (d5e1376).
Report is 3 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #634      +/-   ##
==========================================
- Coverage   57.98%   57.90%   -0.07%     
==========================================
  Files         132      132              
  Lines       11107    11124      +17     
  Branches      956      956              
==========================================
+ Hits         6439     6440       +1     
- Misses       4621     4637      +16     
  Partials       47       47              

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