Update sha2 requirement from 0.8.0 to 0.9.0 in /benchmarks

[dependabot-preview[bot]]

Updates the requirements on sha2 to permit the latest version.

Commits

• bb9f913 sha2 v0.9.0 (#157)
• 6d4cbd8 md5 v0.9.0 (#156)
• 02daf43 Update to digest v0.9 release (#155)
• f56b691 gost94: use digest::Output in macros (#154)
• 26bea13 Use new *Dirty traits from the digest crate (#153)
• 2c14fad Merge pull request #152 from RustCrypto/blake2/crypto-mac-v0.8
• f51af68 blake2: bump crypto-mac to v0.8 release
• ed36412 Merge pull request #151 from RustCrypto/block-buffer/v0.8
• e2a554f Bump block-buffer to v0.8 release
• 55cfbba Merge pull request #150 from RustCrypto/k12/use-digest-crate-alloc-feature
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #53.