chore(deps): update container image ghcr.io/linuxserver/grocy to 4.2.0@ff8e9d1 by renovate (#26420)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[ghcr.io/linuxserver/grocy](https://redirect.github.com/linuxserver/docker-grocy/packages)
([source](https://redirect.github.com/linuxserver/docker-grocy)) |
digest | `73ab1db` -> `ff8e9d1` |

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charts/stable/grocy/Chart.yaml

@@ -33,4 +33,4 @@ sources:
   - https://github.com/grocy/grocy
   - https://github.com/truecharts/charts/tree/master/charts/stable/grocy
 type: application
-version: 20.1.14
+version: 20.1.15

charts/stable/grocy/values.yaml

@@ -1,6 +1,6 @@
 image:
   repository: ghcr.io/linuxserver/grocy
-  tag: 4.2.0@sha256:73ab1dbad5f1d5a1c8a9b4c96142e7e7d1d30bef8245b772ab231fd68632e0ab
+  tag: 4.2.0@sha256:ff8e9d112696158b308b6cf7958a5d58dc56a239ad52b1fd22eb01972943cc73
   pullPolicy: IfNotPresent
 service:
   main: