update doctest and pybind dependencies

[rpreen]

• Updates pybind11 to v3.0.1
• Updates doctest to v2.4.12

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.59%. Comparing base (929e16a) to head (6c6a8d3).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #212   +/-   ##
=======================================
  Coverage   70.59%   70.59%           
=======================================
  Files          61       61           
  Lines        8940     8940           
  Branches      934      934           
=======================================
  Hits         6311     6311           
  Misses       2629     2629           

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud