chore: update docker-compose.yml to v2 (conventional-changelog#4494)

Author: Marukome0743

docker-compose.yml

@@ -1,4 +1,3 @@
-version: "3"
 services:
   commitlint:
     build:
@@ -8,8 +7,8 @@ services:
     ports:
       - "8443:8443"
     environment:
-      - SSH_AUTH_SOCK=/.ssh-agent/socket
-      - SSH_AUTH_PROXY_SOCK=/.ssh-agent/proxy-socket
+      SSH_AUTH_SOCK: /.ssh-agent/socket
+      SSH_AUTH_PROXY_SOCK: /.ssh-agent/proxy-socket
     volumes:
       - .:/root/repo
       - $SSH_AUTH_SOCK:/.ssh-agent/socket