chore(deps): update taiki-e/install-action digest to 6a08c69 (#383) #1486

Job	Run time
Cross-compile to aarch64	1m 20s
Build and test core crates (ubuntu-latest, 1.78)	1m 30s
Build and test (all features) (ubuntu-latest, 1.78)	2m 51s
Build and test (all features) (ubuntu-latest, stable)	2m 31s
Build and test core crates (ubuntu-latest, stable)	1m 22s
Build documentation (ubuntu-latest)	1m 3s
Build and test (all features) (macos-14, 1.78)	2m 28s
Lint	57s
Build and test core crates (macos-14, 1.78)	1m 25s
Build and test (all features) (macos-14, stable)	2m 0s
Build and test core crates (macos-14, stable)	1m 35s
Build and test (all features) (windows-latest, 1.78)	6m 44s
cargo-compare extended tests (ubuntu-latest)	53s
Build and test core crates (windows-latest, 1.78)	4m 24s
Build and test (all features) (windows-latest, stable)	7m 7s
cargo-compare extended tests (macos-14)	1m 1s
Build and test core crates (windows-latest, stable)	5m 21s
	44m 32s

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