Update community files (#3336)

Signed-off-by: Knative Automation <automation@knative.team>

Author: knative-automation

OWNERS_ALIASES

@@ -74,7 +74,6 @@ aliases:
   - upodroid
   productivity-reviewers:
   - evankanderson
-  - mgencur
   productivity-wg-leads:
   - cardil
   - upodroid