Bump deps/zstd from `8689633` to `76779f5`

[dependabot[bot]]

Bumps deps/zstd from 8689633 to 76779f5.

Commits

• 76779f5 Merge pull request #4310 from Cyan4973/cmake_target_compile
• 3ff0d79 Merge pull request #4309 from Cyan4973/check_manual
• 5743da4 Merge pull request #4315 from facebook/dependabot/github_actions/msys2/setup-...
• e1e2f38 Bump msys2/setup-msys2 from 2.26.0 to 2.27.0
• 0c3345d [cmake] use target_compile_definitions
• c2ab0f9 check man page update
• 4690d66 add CI check for zstd_manual before release
• 1bef878 Merge pull request #4302 from facebook/man157
• 6af3842 updated man pages and manual
• d157156 Merge pull request #4300 from facebook/bench_157
• Additional commits viewable in compare view

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