getdeps: upgrade zstd from 1.3.8 -> 1.4.4

Summary:
I'm doing this mostly so that we can avoid using git
to fetch the sources.

Reviewed By: chadaustin

Differential Revision: D21508201

fbshipit-source-id: 54d4635d8938659bea962e90bd829d237f1ed221

build/fbcode_builder/manifests/zstd

@@ -8,13 +8,13 @@ libzstd
 [debs]
 libzstd1-dev
 
-[git]
-repo_url = https://github.com/facebook/zstd.git
-rev = v1.3.8
+[download]
+url = https://github.com/facebook/zstd/releases/download/v1.4.4/zstd-1.4.4.tar.gz
+sha256 = 59ef70ebb757ffe74a7b3fe9c305e2ba3350021a918d168a046c6300aeea9315
 
 [build]
 builder = cmake
-subdir = build/cmake
+subdir = zstd-1.4.4/build/cmake
 
 # The zstd cmake build explicitly sets the install name
 # for the shared library in such a way that cmake discards