Remove serbrech from reviewers and add alexeldeib

Author: Cecile Robert-Michon

OWNERS_ALIASES

@@ -21,7 +21,7 @@ aliases:
     - CecileRobertMichon
     - justaugustus
   cluster-api-azure-reviewers:
+    - alexeldeib
     - devigned
     - juan-lee
     - nader-ziada
-    - serbrech