fix: update external-secrets API version and escape template syntax in grafana-admin-secret manifest

manifest/kube-prometheus-stack/values.yaml

@@ -5621,7 +5621,7 @@ cleanPrometheusOperatorObjectNames: false
 ## If dict, keys are ignored and only values are used.
 ## Items contained within extraObjects can be defined as dict or string and are passed through tpl.
 extraManifests:
-  - apiVersion: external-secrets.io/v1beta1
+  - apiVersion: external-secrets.io/v1
     kind: ExternalSecret
     metadata:
       name: grafana-admin-secret
@@ -5638,7 +5638,7 @@ extraManifests:
           engineVersion: v2
           data:
             admin-user: "admin"
-            admin-password: "{{ .password }}"
+            admin-password: '{{ "{{ .password }}" }}'
       data:
         - secretKey: password
           remoteRef: