Add preliminary Python 3.13 support #262

Job	Run time
manylinux (3.9, manylinux2014_x86_64)	2m 40s
build-package (pypy-3.10, ubuntu-20.04)	1m 2s
manylinux (3.9, manylinux2014_i686)	1m 34s
manylinux (3.9, manylinux2014_aarch64)	23m 17s
build-package (pypy-3.10, windows-latest)	1m 55s
build-package (3.7, ubuntu-20.04)	21s
build-package (3.7, macos-11)	45s
build-package (3.7, windows-latest)	58s
build-package (3.8, ubuntu-20.04)	20s
build-package (3.8, macos-11)	51s
build-package (3.8, windows-latest)	1m 12s
build-package (3.9, ubuntu-20.04)	27s
build-package (3.9, macos-11)	57s
build-package (3.9, windows-latest)	1m 26s
build-package (3.10, ubuntu-20.04)	19s
build-package (3.10, macos-11)	57s
build-package (3.10, windows-latest)	2m 22s
build-package (3.11, ubuntu-20.04)	22s
build-package (3.11, macos-11)	4m 36s
build-package (3.11, windows-latest)	1m 36s
build-package (3.12, ubuntu-20.04)	24s
build-package (3.12, macos-11)	53s
build-package (3.12, windows-latest)	1m 33s
build-package (3.13.0-alpha - 3.13.0, ubuntu-20.04)	28s
build-package (3.13.0-alpha - 3.13.0, macos-11)	1m 11s
build-package (3.13.0-alpha - 3.13.0, windows-latest)	2m 15s
lint	0s
docs	0s
test	0s
coveralls_finish	0s
	54m 41s

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