Support free-threaded Python 3.13 #1468

Job	Run time
pep8,packaging on linux, Rust stable	1m 9s
py312 on alpine	1m 17s
mypy on linux, Rust stable	47s
Python 3.8 on macos-13	1m 19s
py312 on alpine:aarch64	1m 3s
Python 3.8 on win32	1m 34s
py38 on linux, Rust stable	1m 5s
Python 3.8 on macos-latest	1m 37s
py312 on ubuntu-rolling:aarch64	1m 20s
Python 3.13 on win32	2m 22s
py39 on linux, Rust stable	55s
Python 3.13 on macos-13	1m 7s
Python 3.13t on win32	2m 23s
py310 on linux, Rust stable	49s
Python 3.13 on macos-latest	1m 9s
Python 3.8 on win64	1m 39s
py311 on linux, Rust stable	49s
Python 3.13t on macos-13	4m 10s
Python 3.13 on win64	2m 21s
Python 3.13t on macos-latest	1m 40s
py312 on linux, Rust stable	50s
Python 3.13t on win64	2m 18s
py313 on linux, Rust stable	59s
py313 on linux, Rust stable	1m 14s
pypy3 on linux, Rust stable	1m 12s
pypy3 on linux, Rust stable	1m 8s
py313 on linux, Rust 1.64.0	1m 26s
py313 on linux, Rust beta	1m 5s
py313 on linux, Rust nightly	1m 5s
all-green	4s
	41m 56s

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