Update opencti/connector-import-external-reference Docker tag to v6.9.3

Author: renovate[bot]

docker-compose.opensearch.yml

@@ -286,7 +286,7 @@ services:
       opencti:
         condition: service_healthy
   connector-import-external-reference:
-    image: opencti/connector-import-external-reference:6.9.0
+    image: opencti/connector-import-external-reference:6.9.3
     environment:
       - OPENCTI_URL=http://opencti:8080
       - OPENCTI_TOKEN=${OPENCTI_ADMIN_TOKEN}