zstd: Update script to get zstd 1.5.7

Utilities/Scripts/update-zstd.bash

@@ -8,7 +8,7 @@ readonly name="zstd"
 readonly ownership="zstd upstream <[email protected]>"
 readonly subtree="Utilities/cmzstd"
 readonly repo="https://github.com/facebook/zstd.git"
-readonly tag="v1.5.5"
+readonly tag="v1.5.7"
 readonly shortlog=false
 readonly exact_tree_match=false
 readonly paths="