Support free-threaded Python 3.13 #1461

Job	Run time
py312 on alpine	1m 5s
py312 on alpine:aarch64	53s
Python 3.7 on macos-13	33s
Python 3.7 on win32	34s
pep8,packaging on linux, Rust stable	31s
Python 3.13 on macos-13	58s
py312 on ubuntu-rolling:aarch64	1m 10s
Python 3.13 on win32	30s
mypy on linux, Rust stable	32s
Python 3.13 on macos-latest	35s
Python 3.13t on win32	35s
py37 on linux, Rust stable	14s
Python 3.13t on macos-13	2m 13s
Python 3.7 on win64	29s
py38 on linux, Rust stable	31s
Python 3.13t on macos-latest	1m 26s
py39 on linux, Rust stable	30s
Python 3.13 on win64	31s
py310 on linux, Rust stable	33s
Python 3.13t on win64	34s
py311 on linux, Rust stable	32s
py312 on linux, Rust stable	32s
py313 on linux, Rust stable	31s
py313 on linux, Rust stable	19s
pypy3 on linux, Rust stable	19s
pypy3 on linux, Rust stable	32s
py313 on linux, Rust 1.64.0	18s
py313 on linux, Rust beta	18s
py313 on linux, Rust nightly	26s
all-green	2s
	18m 46s

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