⬆️ require pybind11 >= 2.13.5

[burgholzer]

Description

This small PR updates the requirement on pybind11 to 2.13.5 which contains a fix for some relative paths that could trip up compilers.

Checklist:

• The pull request only contains commits that are related to it.
• I have added appropriate tests and documentation.
• I have made sure that all CI jobs on GitHub pass.
• The pull request introduces no new warnings and follows the project's style guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.3%. Comparing base (15a0c7c) to head (279aded).
Report is 62 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #424   +/-   ##
=====================================
  Coverage   92.3%   92.3%           
=====================================
  Files         37      37           
  Lines       2721    2721           
  Branches     305     305           
=====================================
  Hits        2513    2513           
  Misses       208     208           

Flag	Coverage Δ
cpp	94.1% <ø> (ø)
python	87.4% <ø> (ø)

see 3 files with indirect coverage changes