renovate: disable updates for RHEL due to CI breakage

Fixes: c902a23 ("renovate: skip RHEL8 update due provisioning errors")
Signed-off-by: André Martins <andre@cilium.io>

Author: aanm

.github/renovate.json5

@@ -491,13 +491,14 @@
       "versioning": "regex:^((?<compatibility>[a-z0-9-.]+)|((?<major>\\d+)\\.(?<minor>\\d+)))\\-(?<patch>\\d+)\\.(?<build>\\d+)(@(?<currentDigest>sha256:[a-f0-9]+))?$"
     },
     {
-      // Only allow exactly rhel8.6-20250812.093650 for both complexity-test and kind
+      // Disable updates for rhel8.6 for both complexity-test and kind
       // since new versions are making the tests to fail.
+      "enabled": false,
       "matchPackageNames": [
         "quay.io/lvh-images/complexity-test",
         "quay.io/lvh-images/kind"
       ],
-      "allowedVersions": "/^rhel8\\.6-20250812\\.093650$/",
+      "matchCurrentVersion": "/^rhel8\\.6-.*$/"
     },
     {
       "groupName": "stable lvh-images",