fix spawn method (#64) #273

Job	Run time
build-windows (x64)	7m 55s
tests (3.8, Check Python style, isort --check tests/python/ && isort --check python/ black --chec...	5m 6s
build-windows (x86)	7m 50s
info	3s
tests (3.8, Check Rust style, rustfmt --edition 2021 src/*.rs --check )	4m 5s
build-linux (x86_64)	6m 19s
tests (3.8, Lint, flake8 tests/python/ && flake8 python/ )	5m 3s
build-linux (x86)	15m 48s
tests (3.8, Type check, mypy tests/python/ && mypy python/ )	4m 9s
build-linux (aarch64)	6m 51s
sdist	16s
tests (3.8, Test, pytest -vs --color=yes tests/python/ )	5m 8s
build-linux (armv7)	7m 30s
build-macos (x86_64)	1m 33s
build-macos (aarch64)	2m 0s
Release	0s
	1h 19m 36s

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