pin nanobind version in pyproject.toml

[slayoo]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.04%. Comparing base (27ff3e4) to head (f3c2d35).
⚠️ Report is 14 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #470   +/-   ##
=======================================
  Coverage   91.04%   91.04%           
=======================================
  Files          55       55           
  Lines        2636     2636           
  Branches      144      144           
=======================================
  Hits         2400     2400           
  Misses        163      163           
  Partials       73       73           

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[slayoo]

compilation goes OK, but nanobind is also a runtime dependency, and for these we do not enforce any version constraint, hence the same Python 3.8 complaint happens now later on at testing stage...