chore(helm): update image ghcr.io/linuxserver/grav digest to 1b4c0e9 (#31021)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[ghcr.io/linuxserver/grav](https://redirect.github.com/linuxserver/docker-grav/packages)
([source](https://redirect.github.com/linuxserver/docker-grav)) | digest
| `2280a92` -> `1b4c0e9` |

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charts/stable/grav/Chart.yaml

@@ -36,4 +36,4 @@ sources:
   - https://github.com/linuxserver/docker-grav
   - https://github.com/truecharts/charts/tree/master/charts/stable/grav
 type: application
-version: 13.4.1
+version: 13.4.2

charts/stable/grav/values.yaml

@@ -1,7 +1,7 @@
 image:
   repository: ghcr.io/linuxserver/grav
   pullPolicy: IfNotPresent
-  tag: 1.7.48@sha256:2280a923607a89d57c79466e8b6592f9cace86bce6c6c74d326afe14894a1c23
+  tag: 1.7.48@sha256:1b4c0e99bcb3b827b7febf4215ed03e2694b57c608cce63c3ca1a41939caf05d
 service:
   main:
     ports: