Add lentzi90 to cluster-api-openstack-maintainers

Author: mdbooth

OWNERS_ALIASES

@@ -26,9 +26,9 @@ aliases:
     - CecileRobertMichon
   cluster-api-openstack-maintainers:
     - jichenjc
+    - lentzi90
     - mdbooth
     - seanschneeweiss
     - tobiasgiese
   cluster-api-openstack-reviewers:
     - dulek
-    - lentzi90