Update opencti/connector-export-file-txt Docker tag to v6.8.13

Author: renovate[bot]

docker-compose.yml

@@ -157,7 +157,7 @@ services:
       opencti:
         condition: service_healthy 
   connector-export-file-txt:
-    image: opencti/connector-export-file-txt:6.8.5
+    image: opencti/connector-export-file-txt:6.8.13
     environment:
       - OPENCTI_URL=http://opencti:8080
       - OPENCTI_TOKEN=${OPENCTI_ADMIN_TOKEN}