build: add kara to public-api approvers (angular#37143)

This commit adds Kara (me) to the public-api group
so that we can start to divide the public-api code
reviews among more people.

PR Close angular#37143

Author: kara

.pullapprove.yml

@@ -1029,6 +1029,7 @@ groups:
     reviewers:
       users:
         - IgorMinar
+        - kara
 
 
   # ================================================