added 3.9 preview docker images to test matrix

Author: rashtao

.github/workflows/maven.yml

@@ -21,8 +21,10 @@ jobs:
         docker-img:
           - docker.io/arangodb/arangodb:3.7.15
           - docker.io/arangodb/arangodb:3.8.2
+          - docker.io/arangodb/arangodb-preview:3.9.0-alpha.1
           - docker.io/arangodb/enterprise:3.7.15
           - docker.io/arangodb/enterprise:3.8.2
+          - docker.io/arangodb/enterprise-preview:3.9.0-alpha.1
         topology:
           - single
           - cluster
@@ -33,17 +35,6 @@ jobs:
           - 8
         user-language:
           - en
-        include:
-          - docker-img: docker.io/arangodb/arangodb-test:PR14700
-            topology: single
-            db-ext-names: true
-            java-version: 11
-            user-language: tr
-          - docker-img: docker.io/arangodb/enterprise-test:PR14700
-            topology: cluster
-            db-ext-names: true
-            java-version: 17
-            user-language: tr
 
     steps:
       - uses: actions/checkout@v2