Dependencies: Bump sha2 from 0.10.2 to 0.10.6

Bumps sha2 from 0.10.2 to 0.10.6.

Commits

• 1731ced Add OID support (#405)
• cc52373 build(deps): bump cpufeatures from 0.2.4 to 0.2.5 (#403)
• 52def11 Fix MSRV issues by re-releasing gost94 and fsb (#402)
• b1c5032 Fix MSRV issues by re-releasing sha1, sha2, sha3, md5, and whirlpool. Take 2....
• db5af59 Fix MSRV issues by re-releasing sha1, sha2, sha3, md5, and whirlpool (#399)
• b74be34 Remove html_root_url (#393)
• 38ea355 Release md5 v0.10.2, sha1 v0.10.2, sha2 v0.10.3, whirlpool v0.10.2 (#392)
• 4c7a3fa build(deps): bump cpufeatures from 0.2.3 to 0.2.4 (#389)
• e5ad181 Ignore asm feature on unsupported targets (#388)
• 79af27a Expand on DynDigest example in README (#390)
• Additional commits viewable in compare view

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