Support free-threaded Python 3.13 #1483

Job	Run time
Python 3.8 on win32	2m 55s
Python 3.13 on win32	5m 7s
pep8,packaging on linux, Rust stable	1m 13s
Python 3.13t on win32	3m 37s
mypy on linux, Rust stable	47s
Python 3.8 on win64	2m 57s
py38 on linux, Rust stable	51s
Python 3.13 on win64	2m 53s
py312 on alpine	1m 19s
Python 3.13t on win64	3m 49s
py39 on linux, Rust stable	48s
py312 on alpine:aarch64	1m 18s
Python 3.8 on macos-13	1m 37s
py310 on linux, Rust stable	50s
py312 on ubuntu-rolling:aarch64	58s
Python 3.8 on macos-latest	1m 36s
py311 on linux, Rust stable	47s
Python 3.13 on macos-13	1m 28s
py312 on linux, Rust stable	51s
Python 3.13 on macos-latest	48s
py313 on linux, Rust stable	1m 5s
py313 on linux, Rust stable	1m 25s
pypy3 on linux, Rust stable	1m 16s
Python 3.13t on macos-13	3m 2s
pypy3 on linux, Rust stable	1m 13s
py313 on linux, Rust 1.64.0	1m 42s
py313 on linux, Rust beta	1m 5s
Python 3.13t on macos-latest	1m 24s
py313 on linux, Rust nightly	1m 4s
all-green	3s
	49m 48s

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