Add support for Python 3.12 #421

Job	Run time
build-benchmarks (1.65.0)	43s
build-benchmarks (1.65.0)	43s
build-wasm (1.65.0, wasm32-unknown-unknown)	2m 16s
build-wasm (1.65.0, wasm32-unknown-unknown)	2m 16s
build-benchmarks (stable)	36s
build-benchmarks (stable)	36s
python-test (stable, 3.8)	30s
python-test (stable, 3.8)	30s
build-wasm (stable, wasm32-unknown-unknown)	23s
build-wasm (stable, wasm32-unknown-unknown)	23s
build-arm (1.65.0, thumbv7em-none-eabi)	2m 9s
build-arm (1.65.0, thumbv7em-none-eabi)	2m 9s
python-test (stable, 3.12)	47s
python-test (stable, 3.12)	47s
build-arm (stable, thumbv7em-none-eabi)	20s
build-arm (stable, thumbv7em-none-eabi)	20s
test (x86_64-unknown-linux-gnu, 1.65.0)	3m 12s
test (x86_64-unknown-linux-gnu, 1.65.0)	3m 12s
test (x86_64-unknown-linux-gnu, stable)	1m 15s
test (x86_64-unknown-linux-gnu, stable)	1m 15s
codecov	48s
codecov	45s
trigger-wheels	0s
trigger-wheels	0s
	25m 55s

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