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Fix Linux cache invalidation by making creation time optional in file… #155

Job	Run time
Build (ubuntu-latest, x86_64-unknown-linux-musl)	1m 31s
Build (windows-latest, aarch64-pc-windows-msvc)	4m 17s
Build (macos-latest, x86_64-apple-darwin)	1m 52s
Build (windows-latest, x86_64-pc-windows-msvc)	3m 22s
Build (macos-14, aarch64-apple-darwin)	1m 34s
	12m 36s

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