feat(container)!: Update image code.forgejo.org/forgejo/forgejo to v15

Author: renovate[bot]

kubernetes/apps/utilities/forgejo/app/helm-release.yaml

@@ -28,7 +28,7 @@ spec:
     image:
       registry: code.forgejo.org
       repository: forgejo/forgejo
-      tag: 13.0.5
+      tag: 15.0.0
       rootless: true
 
     # Security Context