build(deps): bump Externals/cryptopp from `78a64e3` to `21a40ab`

Created by: dependabot[bot]

Bumps Externals/cryptopp from 78a64e3 to 21a40ab.

Commits

• 21a40ab Correct macro on FreeBSD (PR #1030)
• 597c81e Update comments
• 90abede Fix FreeBSD feature tests
• 91173a2 Implement SIMD checks for FreeBSD on PPC (PR #1029)
• fbea6fd Fold makefile tests into TCOMMAND
• 6abb226 Guard use of SSE2 in makefiles
• c09d94d Fix Aarch64 builds
• d17f037 Remove unneeded asserts
• dd57c4c Cut-in LSH512 AVX2 rotate_msg_gamma
• 25059ee Workaround GCC AVX2 bug
• Additional commits viewable in compare view

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