Updating to unique responsible people in the interim

ownership.yaml

@@ -8,7 +8,7 @@ ownership:
     maintainer: colossus9
     team: github/ps-delivery
     exec_sponsor: toniboyd
-    product_manager: colossus9
+    product_manager: aaronkowall
     repo: https://github.com/github/rally
     tier: 2
     sev1: