Update zemscripten (#286)

build.zig.zon

@@ -15,6 +15,10 @@
             .url = "git+https://github.com/emscripten-core/emsdk#4.0.9",
             .hash = "N-V-__8AAJl1DwBezhYo_VE6f53mPVm00R-Fk28NPW7P14EQ",
         },
+        .zemscripten = .{
+            .url = "git+https://github.com/zig-gamedev/zemscripten?ref=main#00da03b188220374a57cb34cda6230b8d53737ea",
+            .hash = "zemscripten-0.2.0-dev-sRlDqFJSAAB8hgnRt5DDMKP3zLlDtMnUDwYRJVCa5lGY",
+        },
     },
     .minimum_zig_version = "0.15.1",
     .paths = .{