Use 4.3.0+ prefix for Docker image tag

Author: acogoluegnes

.github/workflows/oci-make.yaml

@@ -27,7 +27,7 @@ on:
         default: false
 env:
   REGISTRY_IMAGE: pivotalrabbitmq/rabbitmq
-  VERSION: 4.2.0+${{ github.sha }}
+  VERSION: 4.3.0+${{ github.sha }}
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
   cancel-in-progress: true