remove version 6.0.0 from tests (#793)

Author: adwk67

docs/modules/superset/partials/supported-versions.adoc

@@ -3,5 +3,4 @@
 // Stackable Platform documentation.
 
 - 6.1.0
-- 6.0.0 (deprecated)
 - 4.1.4 (LTS)

tests/test-definition.yaml

@@ -7,7 +7,6 @@ dimensions:
   - name: superset
     values:
       - 4.1.4
-      - 6.0.0
       - 6.1.0
       # Or use a custom image:
       # - 6.1.0,oci.stackable.tech/sandbox/superset:6.1.0
@@ -18,7 +17,6 @@ dimensions:
   - name: superset-old
     values:
       - 4.1.4
-      - 6.0.0
   - name: superset-new
     values:
       - 6.1.0