chore: update helm charts to v0.15.0

Signed-off-by: Gergely Brautigam <182850+Skarlso@users.noreply.github.com>

deploy/charts/external-secrets/values.schema.json

@@ -471,6 +471,9 @@
         "processClusterExternalSecret": {
             "type": "boolean"
         },
+        "processClusterPushSecret": {
+            "type": "boolean"
+        },
         "processClusterStore": {
             "type": "boolean"
         },