go,zig: fix homepages (#5199)

packages/g/go/xmake.lua

@@ -1,6 +1,6 @@
 package("go")
     set_kind("binary")
-    set_homepage("https://golang.org/")
+    set_homepage("https://go.dev")
     set_description("The Go Programming Language")
     set_license("BSD-3-Clause")
 

packages/z/zig/xmake.lua

@@ -1,7 +1,6 @@
 package("zig")
-
     set_kind("toolchain")
-    set_homepage("https://www.ziglang.org/")
+    set_homepage("https://ziglang.org")
     set_description("Zig is a general-purpose programming language and toolchain for maintaining robust, optimal, and reusable software.")
 
     if is_host("macosx") then