Update rustc-hash requirement from 1 to 2 #89

Job	Run time
clippy (ubuntu-latest)	19s
cross (aarch64-unknown-linux-gnu)	20s
clippy (macos-latest)	23s
build (ubuntu-latest)	48s
cross (aarch64-linux-android)	20s
clippy (windows-latest)	58s
build (macos-latest)	47s
cross (aarch64-unknown-linux-musl)	21s
cross (i686-linux-android)	21s
rustfmt (ubuntu-latest)	14s
build (windows-latest)	1m 46s
cross (x86_64-linux-android)	18s
rustfmt (macos-latest)	13s
cross (i686-pc-windows-gnu)	24s
rustfmt (windows-latest)	31s
sanitizer (ubuntu-latest)	2m 46s
cross (x86_64-pc-windows-gnu)	21s
test (ubuntu-latest)	47s
cross (i686-unknown-linux-gnu)	17s
test (macos-latest)	58s
cross (powerpc64-unknown-linux-gnu)	18s
docs	12s
test (windows-latest)	2m 3s
cross (riscv64gc-unknown-linux-gnu)	18s
cross (wasm32-unknown-unknown)	22s
miri (ubuntu-latest)	7m 30s
cross (wasm32-unknown-emscripten)	20s
miri (macos-latest)	6m 33s
cross (wasm32-wasip1)	22s
miri (windows-latest)	19s
cross (wasm32-wasip1-threads)	20s
cross (wasm32-wasip2)	17s
coverage	5m 2s
	37m 8s

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