Update zlib source url to use GitHub

Summary: The url for zlib 1.3.1 is showing a 404 from zlib.net. We can use the GitHub link instead.

Reviewed By: shiva-menta

Differential Revision: D93488447

fbshipit-source-id: a9a898516c0aed8cd240c7cff30fb3ee2804b9fa

Author: KevinYakar

build/fbcode_builder/manifests/zlib

@@ -19,7 +19,7 @@ zlib-ng-compat-static
 zlib
 
 [download]
-url = https://zlib.net/zlib-1.3.1.tar.gz
+url = https://github.com/madler/zlib/releases/download/v1.3.1/zlib-1.3.1.tar.gz
 sha256 = 9a93b2b7dfdac77ceba5a558a580e74667dd6fede4585b91eefb60f03b72df23
 
 [build]