LU-17366 kernel: update SLES15 SP5 [5.14.21-150500.55.39.1]

Update SLES15 SP5 kernel to 5.14.21-150500.55.39.1 for Lustre client.

Test-Parameters: trivial mdtcount=4 mdscount=2 \
clientdistro=sles15sp5 testlist=sanity

Change-Id: Id9476e8726728b00d4079cdaf31b081f89190eb1
Signed-off-by: Jian Yu <yujian@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/53467


Reviewed-by: Colin Faber <cfaber@ddn.com>
Reviewed-by: Yang Sheng <ys@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>