fix(docker-image): update forgejo docker tag to v15.0.2

| datasource | package                               | from   | to     |
| ---------- | ------------------------------------- | ------ | ------ |
| docker     | code.forgejo.org/forgejo-helm/forgejo | 15.0.1 | 15.0.2 |

Author: angelnu-bot[bot]

apps/default/forgejo/release.yaml

@@ -7,7 +7,7 @@ spec:
   chart:
     spec:
       chart: forgejo
-      version: "15.0.1"
+      version: "15.0.2"
       sourceRef:
         kind: HelmRepository
         name: forgejo