Bump deps/libtomcrypt from `427ce33` to `6865b9f`

[dependabot[bot]]

Bumps deps/libtomcrypt from 427ce33 to 6865b9f.

Commits

• 6865b9f Merge pull request #666 from libtom/fix-aesni-in-ci
• dd98fcc Fix AESNI build job
• ce904c8 Merge pull request #644 from tbvdm/aesni
• 33d1c81 Improve SSE4.1/AES-NI support
• e8eb4a0 Merge pull request #664 from libtom/pr/fix-sm4-on-cygwin
• 24e31ef Cygwin fix for SM4 (issue #663)
• fc6b420 Merge pull request #665 from libtom/pr/fix-anon-union
• d85a4e0 avoid using anonymous union (issue #662)
• ab16280 Merge pull request #657 from levitte/ChaoWeiAtGit/develop
• 6f15a45 Add SM4 block cipher
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #729.