fix: mongo upgrade job

rocketchat/migrations/v5/upgrade-job.yml

@@ -16,5 +16,5 @@ spec:
             - -c
             - 'mongosh "mongodb+srv://$(MONGODB_CLUSTER_ADMIN_USER):$(MONGODB_CLUSTER_ADMIN_PASSWORD)@${FQDN}-rs0.${NS}.svc.cluster.local?authSource=admin&replicaSet=rs0&w=majority&ssl=false" --eval "db.adminCommand({setFeatureCompatibilityVersion: \"4.4\"})"'
           envFrom:
-            - configMapRef:
+            - secretRef:
                 name: ${FQDN}-mongodb-users