Log Message:
py-pybind11: updated to 2.7.1

Version 2.7.1

Minor missing functionality added:

Allow Python builtins to be used as callbacks in CPython.

Bug fixes:

Fix regression in CMake Python package config: improper use of absolute path.
Fix Mingw64 and add to the CI testing matrix.
Specified UTF8-encoding in setup.py calls of open().
Add clang-tidy-readability rules to make boolean casts explicit improving code \ 
readability. Also enabled other misc and readability clang-tidy checks.
Move object in .pop() for list.

Backend and tidying up:

Removed and fixed warning suppressions.