ci: remove mmalerba from code reviewers (#32824)

remove mmalerba from code reviewers

Author: mmalerba

.pullapprove.yml

@@ -98,7 +98,6 @@ groups:
       users:
         - adolgachev
         - crisbeto
-        - mmalerba
         - andrewseguin
         - wagnermaciel
         - tjshiu