renovate: pin datatables to the last working version

.renovaterc.json

@@ -15,5 +15,19 @@
   },
   "poetry": {
     "enabled": false
-  }
+  },
+  "packageRules": [
+    {
+      "matchPackageNames": ["datatables.net", "datatables.net-dt"],
+      "allowedVersions": "<1.13"
+    },
+    {
+      "matchPackageNames": ["datatables.net-buttons", "datatables.net-buttons-dt"],
+      "allowedVersions": "<2.3"
+    },
+    {
+      "matchPackageNames": ["datatables.net-responsive", "datatables.net-responsive-dt"],
+      "allowedVersions": "<2.4"
+    }
+  ]
 }
\ No newline at end of file