feat: update to rustc-hash 2 #259
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Motivation
rustc-hash 2.0.0 brings RandomState and performance optimizations, see https://github.com/rust-lang/rustc-hash/blob/master/CHANGELOG.md
Note: we cannot use the
randfeature here because this will let the generated code have random sort, and thus we are not able to do unit tests.