Do not use non-LTS node versions

renovate.json

@@ -5,5 +5,12 @@
     ],
     "npm": {
         "enabled": false
-    }
+    },
+    "packageRules": [
+        {
+            "matchDepNames": ["node"],
+            "matchFiles": ["frontend/Dockerfile", ".gitlab-ci.yml"],
+            "allowedVersions": "!/^\d*[13579](-.*)?$/"
+        }
+    ]
 }