chore(deps): update container image itzg/mc-backup to latest@db4562d by renovate (#21127)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| itzg/mc-backup | digest | `9dcf689` -> `db4562d` |

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This PR has been generated by [Renovate
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charts/stable/minecraft-java/Chart.yaml

@@ -35,4 +35,4 @@ sources:
   - https://hub.docker.com/r/itzg/minecraft-server
   - https://hub.docker.com/r/itzg/mc-backup
 type: application
-version: 8.8.14
+version: 8.8.15

charts/stable/minecraft-java/values.yaml

@@ -60,7 +60,7 @@ j8j9Image:
   pullPolicy: Always
 mcBackupImage:
   repository: itzg/mc-backup
-  tag: latest@sha256:9dcf68940961aafbda243b2c34fe1dd4c52bee03af7c3f6d73e031a54a30d5d2
+  tag: latest@sha256:db4562d32f37fcf934e1bd42c475081e07a6f181b8318d9b706e0ad692f945f1
   pullPolicy: Always
 
 service: