fix(kos): increase number of inotify options

This patch increases the per-user inotify limit in order to allow some
use-case e.g. jellyfin to utilise inotify to check media files.

images/kos/kubernetes/fs/etc/sysctl.d/k8s.conf

 net.bridge.bridge-nf-call-ip6tables = 1
 net.bridge.bridge-nf-call-iptables = 1
-net.ipv4.ip_forward = 1
\ No newline at end of file
+net.ipv4.ip_forward = 1
+fs.inotify.max_user_instances = 8192
+fs.inotify.max_user_watches = 524288