chore(deps): update container image tccr.io/truecharts/xwiki to v15.3.0 (#8277)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [tccr.io/truecharts/xwiki](https://togithub.com/truecharts/containers)
| minor | `15.0.0-postgres` -> `15.3.0-postgres` |

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charts/stable/xwiki/values.yaml

@@ -1,6 +1,6 @@
 image:
   repository: tccr.io/truecharts/xwiki
-  tag: 15.0.0-postgres@sha256:9e283ec143a421cf1818e18b5d46a9a68a70f0b4ea2bebb1f91008b47b8763ae
+  tag: 15.3.0-postgres@sha256:682e692517b5fb4d2e43ffafb7daec123db1eb7428afc88b164a28728e3de93c
   pullPolicy: IfNotPresent
 service:
   main: