Require Zig 0.13.0 or later

`build.zig` no longer works with Zig 0.12.x.

Author: jayschwa

build.zig.zon

@@ -1,7 +1,7 @@
 .{
     .name = "SDL",
-    .minimum_zig_version = "0.12.0",
     .version = "2.30.12",
+    .minimum_zig_version = "0.13.0",
     .dependencies = .{},
     .paths = .{
         "LICENSE.txt",