denylist: extend snooze for coreos.ignition.ssh.key

This test is still failing so let's bump the snooze while we work
to find a fix for coreos/fedora-coreos-tracker#1553

kola-denylist.yaml

@@ -17,7 +17,7 @@
     - testing-devel
 - pattern: coreos.ignition.ssh.key
   tracker: https://github.com/coreos/fedora-coreos-tracker/issues/1553
-  snooze: 2023-09-27
+  snooze: 2023-10-13
   warn: true
   platforms:
     - azure