OCPBUGS-65585: Update the RHCOS 4.21 bootimage metadata to 9.6.20251113-0

The changes done here will update the RHCOS 4.21 bootimage metadata and
address the following issues:

OCPBUGS-61669: [4.21] [OCP 4.18] coreos-boot-disk link not working with
  multipath on early boot

This change was generated using:

plume cosa2stream \
    --target data/data/coreos/rhcos.json \
    --distro rhcos \
    --no-signatures \
    --name rhel-9.6 \
    --url https://rhcos.mirror.openshift.com/art/storage/prod/streams \
    x86_64=9.6.20251113-0        \
    aarch64=9.6.20251113-0       \
    s390x=9.6.20251113-0         \
    ppc64le=9.6.20251113-0

Signed-off-by: Tiago Bueno <[email protected]>

Author: tlbueno