Update flecs submodule to official V4 release!

Author: BeanCheeseBurrito

.gitmodules

@@ -1,4 +1,4 @@
 [submodule "submodules/flecs"]
 	path = submodules/flecs
 	url = https://github.com/SanderMertens/flecs
-	branch = v4
+	branch = master

src/Flecs.NET.Bindings/Flecs.g.cs

@@ -883,9 +883,6 @@ public static unsafe partial class flecs
         [System.Runtime.InteropServices.DllImport(BindgenInternal.DllImportPath, EntryPoint = "ecs_ptr_from_json", CallingConvention = System.Runtime.InteropServices.CallingConvention.Cdecl)]
         public static extern byte* ecs_ptr_from_json(ecs_world_t* world, ulong type, void* ptr, byte* json, ecs_from_json_desc_t* desc);
 
-        [System.Runtime.InteropServices.DllImport(BindgenInternal.DllImportPath, EntryPoint = "ecs_ptr_from_json_legacy", CallingConvention = System.Runtime.InteropServices.CallingConvention.Cdecl)]
-        public static extern byte* ecs_ptr_from_json_legacy(ecs_world_t* world, ulong type, void* ptr, byte* json, ecs_from_json_desc_t* desc);
-
         [System.Runtime.InteropServices.DllImport(BindgenInternal.DllImportPath, EntryPoint = "ecs_ptr_to_expr", CallingConvention = System.Runtime.InteropServices.CallingConvention.Cdecl)]
         public static extern byte* ecs_ptr_to_expr(ecs_world_t* world, ulong type, void* data);