Update the docker compose files for the new Docker Desktop release

Signed-off-by: Michael Yuan <michael@secondstate.io>

wasmedge-mysql-nginx/.docker/docker-compose.yml

@@ -8,10 +8,9 @@ services:
 
   backend:
     image: demo-microservice
+    platform: wasi/wasm
     build:
       context: backend/
-      platforms:
-        - wasi/wasm32
     ports:
       - 8080:8080
     environment:

wasmedge-mysql-nginx/compose.yml

@@ -8,10 +8,9 @@ services:
 
   backend:
     image: demo-microservice
+    platform: wasi/wasm
     build:
       context: backend/
-      platforms:
-        - wasi/wasm32
     ports:
       - 8080:8080
     environment: