fixup! [FLINK-36332] Explicit mapping between tag and image.

Author: SamBarker

.github/workflows/ci.yml

@@ -146,7 +146,6 @@ jobs:
         mode: [ "native", "standalone" ]
         namespace: [ "flink" ]
         java-version: [ "11" ]
-        image: [ "flink:1.20" ]
         test:
           - test_application_operations.sh
           - test_multi_sessionjob.sh