Bump actions/checkout from 3 to 4 #96

Job	Run time
Linter	1m 15s
Test (3.7, ubuntu, false)	54s
Test (3.7, macos, false)	1m 28s
Test (3.7, windows, false)	1m 27s
Test (3.7, Y, ubuntu, false)	26s
Test (3.8, ubuntu, false)	51s
Test (3.8, macos, false)	1m 10s
Test (3.8, windows, false)	2m 53s
Test (3.8, Y, ubuntu, false)	39s
Test (3.9, ubuntu, false)	49s
Test (3.9, macos, false)	1m 27s
Test (3.9, windows, false)	1m 53s
Test (3.9, Y, ubuntu, false)	30s
Test (3.10, ubuntu, false)	52s
Test (3.10, macos, false)	1m 41s
Test (3.10, windows, false)	2m 1s
Test (3.10, Y, ubuntu, false)	29s
Test (3.11, ubuntu, false)	49s
Test (3.11, macos, false)	1m 18s
Test (3.11, windows, false)	3m 0s
Test (3.11, Y, ubuntu, false)	29s
Test (pypy-3.9, Y, false, ubuntu)	59s
Test (pypy-3.8, Y, false, ubuntu)	1m 8s
Test (3.12-dev, true, ubuntu)	1m 9s
Test (3.12-dev, Y, true, ubuntu)	49s
Tests status	2s
Pre-Deploy	0s
Build wheels on ${{ matrix.os }} ${{ matrix.qemu }}	0s
Tarball	0s
Deploy	0s
	30m 28s

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