Bump actions/cache from 3 to 4 #106

Job	Run time
lint and style checks	24s
test (windows-latest, 3.8, false, false)	4m 11s
test (windows-latest, 3.9, false, false)	4m 50s
test (windows-latest, 3.10, false, false)	4m 43s
test (ubuntu-latest, 3.8, false, false)	1m 48s
test (ubuntu-latest, 3.9, false, false)	1m 49s
test (ubuntu-latest, 3.10, false, false)	1m 41s
test (macos-latest, 3.8, false, false)	5m 34s
test (macos-latest, 3.9, false, false)	2m 46s
test (macos-latest, 3.10, false, false)	5m 29s
test (3.11, ubuntu-latest, true, false)	1m 48s
test (3.10, ubuntu-latest, false, true)	1m 21s
coveralls	10s
	36m 34s

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