feat(container): update image ghcr.io/tarampampam/error-pages to v2.21.0 (#643)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

kubernetes/apps/networking/ingress-nginx/app/helmrelease.yaml

@@ -76,7 +76,7 @@ spec:
       enabled: true
       image:
         repository: ghcr.io/tarampampam/error-pages
-        tag: 2.20.0
+        tag: 2.21.0
       extraEnvs:
         - name: TEMPLATE_NAME
           value: lost-in-space