Add omkar-foss to the triage team (apache#43169)

This will allow him to interact with the GitHub project for sig-debugging: apache#40975

.asf.yaml

@@ -123,6 +123,7 @@ github:
     # https://github.com/apache/infrastructure-asfyaml/blob/main/README.md#assigning-the-github-triage-role-to-external-collaborators
     - aritra24
     - dirrao
+    - omkar-foss
     - rawwar
     - nathadfield
     - sunank200