test: Bump OPA to 1.4.2

Author: NickLarsenNZ

tests/test-definition.yaml

@@ -18,7 +18,7 @@ dimensions:
       # - 2.9.3,oci.stackable.tech/sandbox/airflow:2.9.3-stackable0.0.0-dev
   - name: opa-latest
     values:
-      - 1.0.1
+      - 1.4.2
   - name: ldap-authentication
     values:
       - no-tls