Fix: Correct Zstd capitalization in FindZstd.cmake Summary: X-link: https://github.com/facebook/folly/pull/2379 This commit addresses a CMake warning due to inconsistent capitalization of the Zstd package name in FindZstd.cmake. This fixes issues with finding and using the Zstd library. Tested on Cmake 3.28.3 X-link: https://github.com/facebookincubator/zstrong/pull/1170 Reviewed By: terrelln Differential Revision: D69284782 fbshipit-source-id: 4acc32705ae937f075e1531cae3449cfae0d84ec