rikatz is stepping down (#12517)

Co-authored-by: Marco Ebert <marco_ebert@icloud.com>

Author: k8s-infra-cherrypick-robot

.github/ISSUE_TEMPLATE/cve_report.md

@@ -5,7 +5,6 @@ title: ''
 labels: kind/bug
 assignees:
     - Gacko
-    - rikatz
     - strongjz
 ---
 

charts/ingress-nginx/Chart.yaml

@@ -16,7 +16,6 @@ maintainers:
 - name: cpanato
 - name: Gacko
 - name: puerco
-- name: rikatz
 - name: strongjz
 - name: tao12345666333
 name: ingress-nginx