Add the kubeVersion in the CloudnativePG chart metadata.

Add The field `kubeVersion` in the charts. Affected Charts cloudnative-pg Cluster plugin-braman-cloud Current Values: ` ``` apiVersion: v2 name: cloudnative-pg description: CloudNativePG Operator Helm Chart icon: https://raw.githubusercontent.com/cloudnative-pg/artwork/main/cloudnativepg-logo.svg type: application version: "0.27.1" appVersion: "1.28.1" [......] ``` ` Expected Values ` ``` apiVersion: v2 name: cloudnative-pg description: CloudNativePG Operator Helm Chart kubeVersion: ">=1.29.0-0" icon: https://raw.githubusercontent.com/cloudnative-pg/artwork/main/cloudnativepg-logo.svg type: application version: "0.27.1" appVersion: "1.28.1" ``` [......] `