revert to 4.17.12 because the update will occur at a separate PR

Signed-off-by: Fortune-Ndlovu <fndlovu@redhat.com>

Author: Fortune-Ndlovu

.ci/pipelines/cluster/osd-gcp/create-osd.sh

@@ -8,7 +8,7 @@ export PATH=$WORKSPACE:$PATH
 CLIENT_ID="${CLIENT_ID:-$(cat /tmp/osdsecrets/OSD_CLIENT_ID)}"
 CLIENT_SECRET="${CLIENT_SECRET:-$(cat /tmp/osdsecrets/OSD_CLIENT_SECRET)}"
 SERVICE_ACCOUNT_FILE="${SERVICE_ACCOUNT_FILE:-$(cat /tmp/osdsecrets/SERVICE_ACCOUNT_FILE)}"
-OSD_VERSION="${OSD_VERSION:-4.20.0}"
+OSD_VERSION="${OSD_VERSION:-4.17.12}"
 
 if [ -n "$CLUSTER_NAME" ]; then
   echo $CLUSTER_NAME > $WORKSPACE/cluster-info.name