Bump min Zig version to 0.15.1 to fix Windows CI

Author: jayschwa

build.zig.zon

@@ -2,7 +2,7 @@
     .name = .SDL_image,
     .version = "2.8.8",
     .fingerprint = 0x7d6df3671d68a2f9,
-    .minimum_zig_version = "0.15.0",
+    .minimum_zig_version = "0.15.1",
     .dependencies = .{
         .SDL = .{
             .url = "git+https://github.com/allyourcodebase/SDL#25dc764272bf117198f3cd6f44f52dae5c45d60a",