removing deprecated version line from Docker Compose files

docker-compose.prod.yml

@@ -1,4 +1,3 @@
-version: "3.9"
 services:
   web:
     build: ./web

docker-compose.yml

@@ -1,4 +1,3 @@
-version: "3.0"
 services:
   web:
     build: ./web