ci(renovate): Force stable Fedora version

After a long time of waiting for a better solution, this patch forces
the current stable version of Fedora container images.

renovate.json

@@ -27,5 +27,12 @@
       "datasourceTemplate": "docker",
       "versioningTemplate": "docker"
     }
+  ],
+  "packageRules": [
+    {
+      "matchDatasources": ["docker"],
+      "matchPackageNames": ["registry.fedoraproject.org/fedora"],
+      "allowedVersions": "<37"
+    }
   ]
 }