Performance: Try disabling GIL and enabling JIT after upgrading to Python 3.13

[jpmckinney]

Test multi-threaded apps with GIL disabled. Test performance with JIT enabled.

GIL support needed for packages with extensions:

• orjson Python 3.13 with no gil - SystemError: init function of orjson returned uninitialized object ijl/orjson#520
• psycopg2 (will need to upgrade to psycopg, if it happens) Provide Python 3.13 wheels psycopg/psycopg#889 (comment)
• lxml https://bugs.launchpad.net/lxml/+bug/2069434
• cryptography Building from Git with 3.14 Linux no-GIL fails pyca/cryptography#11436 (comment) Tracking issue for no-gil/freethreaded work PyO3/pyo3#4265

https://py-free-threading.github.io/tracking/