Bump bytecount from 0.6.5 to 0.6.7 #3943

Job	Run time
Check	26s
Check if cbindgen runs cleanly for generating the C headers	1m 53s
coverage	5m 3s
Lints (beta)	1m 0s
minimum_rust_version	6m 31s
Publish (dry-run)	50s
Lints (stable)	39s
test (beta)	2m 47s
test_all_features	16m 22s
test (stable)	2m 22s
Check if wasm-pack builds a valid package for the sourmash crate	1m 48s
Run tests under wasm32-wasi	1m 52s
test (windows)	5m 58s
test (macos)	2m 32s
	50m 3s

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