Add bnallapeta to reviewers

Signed-off-by: Lennart Jern <lennart.jern@est.tech>

Author: lentzi90

OWNERS_ALIASES

@@ -22,4 +22,5 @@ aliases:
     - emilienm
     - lentzi90
   cluster-api-openstack-reviewers:
+    - bnallapeta
     - smoshiur1237