Bump actions/cache from 3 to 4 #105

Job	Run time
lint and style checks	21s
test (windows-latest, 3.8, false, false)	4m 38s
test (windows-latest, 3.9, false, false)	3m 54s
test (windows-latest, 3.10, false, false)	4m 47s
test (ubuntu-latest, 3.8, false, false)	1m 45s
test (ubuntu-latest, 3.9, false, false)	1m 43s
test (ubuntu-latest, 3.10, false, false)	1m 46s
test (macos-latest, 3.8, false, false)	3m 38s
test (macos-latest, 3.9, false, false)	3m 17s
test (macos-latest, 3.10, false, false)	3m 38s
test (3.11, ubuntu-latest, true, false)	1m 53s
test (3.10, ubuntu-latest, false, true)	1m 16s
coveralls	9s
	32m 45s

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