OWNERS: Bugzilla product should be "OpenShift Update Service"

Based on Scott's [1]:

> It's used downstream to facilitate mapping to BZ Components.

I'm not sure if this property matters to us, because we are a separate
Red Hat product, not a component under the OpenShift Container Project
product.  But 'Cincinnati Operator' no longer exists anywhere, so
pointing folks at our current product name isn't breaking it any
worse.

$ curl -s 'https://bugzilla.redhat.com/rest/product/OpenShift%20Update%20Service' | jq -r '.products[].name'
OpenShift Update Service
$ curl 'https://bugzilla.redhat.com/rest/product/Cincinnati%20Operator'
{"products":[]}

[1]: openshift/cluster-version-operator#344 (comment)

OWNERS

@@ -21,4 +21,4 @@ reviewers:
 - jottofar
 - vrutkovs
 
-component: "Cincinnati Operator"
+component: OpenShift Update Service