Bump actions/cache from 4 to 5 (#5) #20

Job	Run time
Julia lts - ubuntu-latest - x64 - push	2m 44s
Julia 1 - ubuntu-latest - x64 - push	3m 37s
Julia lts - macOS-latest - x64 - push	5m 43s
Julia 1 - macOS-latest - x64 - push	5m 34s
Julia 1 - windows-latest - x64 - push	5m 16s
Julia lts - windows-latest - x64 - push	3m 40s
	26m 34s

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