Update module github.com/DataDog/zstd to v1.5.6

This MR contains the following updates:

Package	Type	Update	Change
github.com/DataDog/zstd	require	patch	v1.5.5 -> v1.5.6

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Release Notes

DataDog/zstd (github.com/DataDog/zstd)

v1.5.6: zstd 1.5.6

Compare Source

What's Changed

• Fix readme typo by @​colinlyguo in https://github.com/DataDog/zstd/pull/136
• Update upperBound ratio when guessing the required decompression buffer size by @​sfluor in https://github.com/DataDog/zstd/pull/141
• Update vendored zstd to 1.5.6 by @​Viq111 in https://github.com/DataDog/zstd/pull/143

Full Changelog: https://github.com/DataDog/zstd/compare/v1.5.5+patch1...v1.5.6

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