Update Docker Compose version to 2.21.0

Author: perfetti

.circleci/config.yml

@@ -39,19 +39,10 @@ jobs:
     steps:
       - checkout
 
-      - docker/install-docker-compose:
-          version: "2.14.2"
-
       - run:
           name: Build and start Docker Compose services
           command: bash ./build_github.sh
 
-      - run:
-          name: Check DNS and network
-          command: |
-            cat /etc/hosts
-            netstat -tulpn
-
       - run:
           name: Check service ports
           command: |