Bump fixedbitset from 0.4.2 to 0.5.7 #5092

Job	Run time
Check	33s
Check if cbindgen runs cleanly for generating the C headers	6m 24s
coverage	7m 58s
Lints (beta)	37s
Lints (stable)	34s
minimum_rust_version	7m 51s
Publish (dry-run)	8m 24s
test (beta)	1m 13s
test (stable)	1m 12s
test_all_features	1m 24s
Run tests under wasm32-wasi	1m 11s
test (windows)	2m 59s
test (macos)	1m 17s
Check if wasm-pack builds a valid package for the sourmash crate	1m 28s
	43m 5s

Provide feedback