Log hash key at debug level instead of trace #2649

Job	Run time
build sccache x86_64-unknown-linux-musl	9m 9s
build sccache-dist x86_64-unknown-linux-musl	7m 22s
build sccache aarch64-unknown-linux-musl	9m 42s
build sccache x86_64-apple-darwin	12m 53s
build sccache aarch64-apple-darwin	14m 19s
build sccache x86_64-pc-windows-msvc	13m 7s
coverage ubuntu-20.04 rust nightly	7m 31s
coverage macOS-11 rust nightly	10m 22s
clippy ubuntu-latest	2m 39s
clippy macOS-latest	14m 32s
clippy windows-latest	4m 39s
rustfmt ubuntu-latest	18s
test ubuntu-20.04 rust 1.65.0	5m 27s
test ubuntu-22.04 rust 1.65.0 dist-server	6m 32s
test ubuntu-20.04 rust stable	5m 14s
test ubuntu-20.04 rust beta	5m 18s
test ubuntu-20.04 rust nightly	4m 43s
test ubuntu-22.04 rust stable	5m 2s
test macOS-11 rust stable	5m 5s
test windows-2019 rust 1.65.0	8m 2s
test windows-2019 rust nightly	8m 21s
test windows-2019 rust beta	6m 52s
test freebsd-13.1 rust stable (macos-12, 13.1)	11m 51s
toml_format	8s
release	0s
	2h 59m 8s

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