Revert "chore(deps): update helm release kyverno to v2.1.6"

Turns out kyverno doesn't like its new version, since the deployments
have the wrong name. Needs some further investigation.

This reverts commit fca00b09.

bootstrap/kyverno/release.yaml

@@ -12,7 +12,7 @@ spec:
         kind: HelmRepository
         name: kyverno
       # renovate: helmRepo=https://kyverno.github.io/kyverno/ depName=kyverno
-      version: v2.1.6
+      version: v2.1.4
   interval: 5m
   values:
     replicaCount: 2