Update appVersion to v2.51.2

Co-authored-by: Elio Bischof <elio@zitadel.com>

Author: kleberbaum

charts/zitadel/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v2
 name: zitadel
 description: A Helm chart for ZITADEL
 type: application
-appVersion: "v2.51.0"
+appVersion: "v2.51.2"
 version: 7.13.0
 kubeVersion: ">= 1.21.0-0"
 icon: https://zitadel.com/zitadel-logo-dark.svg