GitLab

* style: use Black everywhere

* style: minor touchup from review

* tests: Don't run tests that often segfault

* tests: drop all cross module gil tests

* tests: try skipping all macOS Python 3.9 tests

* tests: drop macOS Python 3.9

* ci: harden chrono test, mark another macos 4.9 dev failure

This should help with a little of the flakiness seen with the timing test

* Update tests/test_chrono.py

* Can also fail

This is only necessary if `get_internals` is called for the first time in a given module when the running thread is in a GIL-released state.

Fixes #1364

This avoids GIL deadlocking when pybind11 tries to acquire the GIL in a thread that already acquired it using standard Python API (e.g. when running from a Python thread).