Bump deps/zstd from `8689633` to `ff7a151`

[dependabot[bot]]

Bumps deps/zstd from 8689633 to ff7a151.

Commits

• ff7a151 update test name
• eb54140 Merge pull request #4025 from alexlnkp/dev
• 1232d4c Merge pull request #3931 from bgilbert/pthread
• da797d0 Merge pull request #4019 from b7f7/fix_cmake_rc_build
• fb5a5e4 Merge pull request #4020 from Ansuel/install-mt-pc
• 849b2ad removed freeing of the ptr
• 0b24fc0 init out char array with all members as 0 x2
• b4ecf72 made initialize out char array with all elements set to 0
• 75d0f66 reverted the addition of free at the gz_init()
• 01cea2e fixed ISO C incompatibility
• Additional commits viewable in compare view

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