keys: rename `show` to `secret` #7293

Job	Run time
build-and-test (msrv, ubuntu-latest-16-cores, x86_64-unknown-linux-gnu)	6m 19s
build-and-test (msrv, ubuntu-jammy-16-cores-arm64, aarch64-unknown-linux-gnu)	7m 18s
build-and-test (msrv, macos-latest, x86_64-apple-darwin)	11m 10s
build-and-test (msrv, macos-latest, aarch64-apple-darwin)	12m 49s
build-and-test (msrv, windows-latest-8-cores, x86_64-pc-windows-msvc)	12m 53s
build-and-test (latest, ubuntu-latest-16-cores, x86_64-unknown-linux-gnu)	5m 24s
build-and-test (latest, ubuntu-jammy-16-cores-arm64, aarch64-unknown-linux-gnu)	7m 47s
build-and-test (latest, macos-latest, x86_64-apple-darwin)	11m 14s
build-and-test (latest, macos-latest, aarch64-apple-darwin)	11m 4s
cargo-deny (advisories)	44s
build-and-test (latest, windows-latest-8-cores, x86_64-pc-windows-msvc)	11m 33s
cargo-deny (bans)	46s
cargo-deny (licenses)	43s
cargo-deny (sources)	44s
check-generated-full-help-docs	4m 9s
fmt	16s
publish-dry-run	0s
complete	1s
	1h 44m 54s

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