Make sure all cache access is encapsulated in the ProtofetchGitCache #292

Job	Run time
lint	32s
test (ubuntu-latest)	35s
update-release-draft	0s
test (macos-latest)	47s
test (windows-latest)	2m 21s
package (aarch64-unknown-linux-musl, ubuntu-latest, tar, true)	3m 56s
package (x86_64-unknown-linux-musl, ubuntu-latest, tar, true)	3m 48s
package (aarch64-apple-darwin, macos-latest-xlarge, gtar, false)	1m 3s
package (x86_64-apple-darwin, macos-latest, gtar, false)	3m 17s
package (x86_64-pc-windows-msvc, windows-latest, tar, false, .exe)	4m 43s
release	0s
	21m 2s

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