build: update golang version to 1.18.8
build: update golang version to 1.18.8

the latest 1.18 version of go binary is 1.18.8 and this commit
update the package to the latest.

Signed-off-by: Humble Chirammal <dc8ba7e82a7df22725dedec9b10c7aaab9ec713f@redhat.com>

ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi