LU-17041 kernel: update RHEL 8.8 [4.18.0-477.21.1.el8_8]

LU-17041 kernel: update RHEL 8.8 [4.18.0-477.21.1.el8_8]

Update RHEL 8.8 kernel to 4.18.0-477.21.1.el8_8.

Lustre-change: https://review.whamcloud.com/52003
Lustre-commit: TBD (from 4268396e4ee6e33a91b11ba4d0f77838aa3c172a)

Test-Parameters: trivial fstype=ldiskfs \
clientdistro=el8.8 serverdistro=el8.8 testlist=sanity

Test-Parameters: trivial fstype=zfs \
clientdistro=el8.8 serverdistro=el8.8 testlist=sanity

Change-Id: Ie24c8e438dd33afafb900664d9a4010160bc1a45
Signed-off-by: Jian Yu <yujian@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/52008
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Yang Sheng <ys@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>