Bump actions/checkout from 3 to 4 #309

Job	Run time
Test on ubuntu-latest / 2.19.6	20s
Test on ubuntu-latest / stable	1m 50s
Test on ubuntu-latest / beta	1m 55s
Test on ubuntu-latest / dev	2m 33s
Test on windows-latest / 2.19.6	28s
Test on windows-latest / stable	2m 51s
Test on windows-latest / beta	2m 36s
Test on windows-latest / dev	2m 31s
Test on macos-latest / 2.19.6	26s
Test on macos-latest / stable	2m 15s
Test on macos-latest / beta	2m 16s
Test on macos-latest / dev	4m 3s
	24m 4s

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