test: Remove OpenSearch 3.4.0 for now

Author: siegfriedweber

tests/test-definition.yaml

@@ -3,7 +3,6 @@ dimensions:
   - name: opensearch
     values:
       - 3.1.0
-      - 3.4.0
       # To use a custom image, add a comma and the full name after the product version, e.g.:
       # - 3.1.0,oci.stackable.tech/sandbox/opensearch:3.1.0-stackable0.0.0-dev
       # - 3.1.0,localhost:5000/sdp/opensearch:3.1.0-stackable0.0.0-dev