build(deps): bump Externals/cryptopp from `78a64e3` to `df06a2d`

Created by: dependabot[bot]

Bumps Externals/cryptopp from 78a64e3 to df06a2d.

Commits

• df06a2d Fix typo
• 0497eb4 Make SHA-NI independent of AVX and AVX2 (GH #1045)
• 06a0ec2 Fixed typos (PR #1055)
• b810876 Fix compile on CentOS 5
• 45de5c6 Update Readme.txt (PR #1052)
• 04b84da Update comments
• fabd88e Use GenerateWord32 impl from Crypto++ 5.4
• 8942432 Whitespace check-in
• 7101e9e Endian swap outptu OldRandomPool::GenerateWord32
• 1124a3d Clear MSVC warning
• Additional commits viewable in compare view

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