Update ccm requirement from 0.4.0 to 0.5.0

[dependabot[bot]]

Updates the requirements on ccm to permit the latest version.

Commits

• 2396b36 ccm v0.5.0 (#449)
• 6571311 aes-siv v0.7.0 (#448)
• cc0b7d6 Make ChaChaPoly1305 explicitly implement ZeroizeOnDrop (#447)
• d6f510e Enable getrandom feature by defaut; improve docs (#446)
• 4637eb5 Bump UHF crates to universal-hash v0.5.0-pre.2 prereleases (#445)
• 9e33b75 Bump aead crate dependency to v0.5 (#444)
• 0b24c8d build(deps): bump zeroize from 1.5.6 to 1.5.7 (#443)
• fdad6b8 Cut -pre.2 releases of crates which use UHFs (#442)
• 00c4230 Replace Choice::unwrap_u8 calls with Into (#441)
• 0f001fd xsalsa20poly1305: bump poly1305 to v0.8.0-pre.1 (#440)
• Additional commits viewable in compare view

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[henrikssn]

@dependabot rebase