Bump actions/cache from 3 to 4 #1165

Job	Run time
test (RootFinding, 1.10, ubuntu-latest)	31m 56s
test (RootFinding, 1.10, macos-latest)	52m 45s
test (RootFinding, 1.10, windows-latest)	34m 6s
test (NLLSSolvers, 1.10, ubuntu-latest)	7m 14s
test (NLLSSolvers, 1.10, macos-latest)	10m 3s
test (NLLSSolvers, 1.10, windows-latest)	9m 59s
test (23TestProblems, 1.10, ubuntu-latest)	7m 59s
test (23TestProblems, 1.10, macos-latest)	16m 43s
test (23TestProblems, 1.10, windows-latest)	11m 11s
test (Wrappers, 1.10, ubuntu-latest)	7m 36s
test (Wrappers, 1.10, macos-latest)	15m 7s
test (Wrappers, 1.10, windows-latest)	10m 43s
test (Miscellaneous, 1.10, ubuntu-latest)	10m 22s
test (Miscellaneous, 1.10, macos-latest)	11m 35s
test (Miscellaneous, 1.10, windows-latest)	14m 44s
	4h 12m 3s

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