removed 3.11 tests

Author: rashtao

.circleci/config.yml

@@ -454,10 +454,7 @@ workflows:
           matrix:
             parameters:
               docker-img:
-                - 'docker.io/arangodb/arangodb:3.11'
                 - 'docker.io/arangodb/arangodb:3.12'
-                - 'docker.io/arangodb/enterprise:3.11'
-                - 'docker.io/arangodb/enterprise:3.12'
               topology:
                 - 'single'
               args:
@@ -467,10 +464,7 @@ workflows:
           matrix:
             parameters:
               docker-img:
-                - 'docker.io/arangodb/arangodb:3.11'
                 - 'docker.io/arangodb/arangodb:3.12'
-                - 'docker.io/arangodb/enterprise:3.11'
-                - 'docker.io/arangodb/enterprise:3.12'
               topology:
                 - 'cluster'
               args: