chore(deps): update actions/cache action to v6 #804

Job	Run time
cargo fmt --all -- --check	7s
cargo check (ubuntu-latest)	12s
Code Coverage (macos-latest, macos)	3m 30s
cargo check (windows-latest)	51s
cargo clippy -- -D warnings (ubuntu-latest)	11s
cargo test (macOS-latest)	4m 57s
Code Coverage (ubuntu-latest, unix)	2m 6s
cargo test (windows-latest)	5m 2s
Code Coverage (windows-latest, windows)	7m 44s
cargo check (macOS-latest)	12s
cargo test (ubuntu-latest)	46s
cargo clippy -- -D warnings (macOS-latest)	27s
cargo clippy -- -D warnings (windows-latest)	43s
	26m 48s

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