Avoid CME during Indigo model bake on Fabric

Author: embeddedt

fabric/src/main/java/org/embeddedt/modernfix/fabric/mixin/perf/dynamic_resources/ModelBakeryMixin.java

@@ -300,7 +300,7 @@ public UnbakedModel put(ResourceLocation key, UnbakedModel value) {
         };
         // bake indigo models
         Stopwatch watch = Stopwatch.createStarted();
-        this.topLevelModels.forEach((key, value) -> {
+        new ArrayList<>(this.topLevelModels.keySet()).forEach(key -> {
             try {
                 this.bake(key, BlockModelRotation.X0_Y0);
             } catch(RuntimeException e) {