chore(deps): update container image ghcr.io/linuxserver/grav to 1.7.46@8b9997a by renovate (#24973)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[ghcr.io/linuxserver/grav](https://togithub.com/linuxserver/docker-grav/packages)
([source](https://togithub.com/linuxserver/docker-grav)) | digest |
`9b5ec86` -> `8b9997a` |

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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: 13.1.7
+version: 13.1.8

charts/stable/grav/values.yaml

@@ -1,7 +1,7 @@
 image:
   repository: ghcr.io/linuxserver/grav
   pullPolicy: IfNotPresent
-  tag: 1.7.46@sha256:9b5ec8661021656661a2b4f1cbb8ee3103d4c6ec46d87a029ce9beceb99ad8b5
+  tag: 1.7.46@sha256:8b9997a1a6b0b34922fbc8b388b0c336498e04787b1c8f35404fee7c0d27fff5
 service:
   main:
     ports: