updated test docker images

Author: rashtao

.github/workflows/maven.yml

@@ -32,12 +32,10 @@ jobs:
       fail-fast: false
       matrix:
         docker-img:
-          - docker.io/arangodb/arangodb:3.5.7
-          - docker.io/arangodb/arangodb:3.6.11
-          - docker.io/arangodb/arangodb:3.7.6
-          - docker.io/arangodb/enterprise:3.5.7
-          - docker.io/arangodb/enterprise:3.6.11
-          - docker.io/arangodb/enterprise:3.7.6
+          - docker.io/arangodb/arangodb:3.6.12
+          - docker.io/arangodb/arangodb:3.7.9
+          - docker.io/arangodb/enterprise:3.6.12
+          - docker.io/arangodb/enterprise:3.7.9
         topology:
           - single
           - cluster