chore(deps): update container image ghcr.io/mriedmann/humhub-phponly to v1.15.2@9987a9e by renovate (#16889)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[ghcr.io/mriedmann/humhub-phponly](https://togithub.com/mriedmann/humhub-docker)
| patch | `1.15.0` -> `1.15.2` |

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### Configuration

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This PR has been generated by [Renovate
Bot](https://togithub.com/renovatebot/renovate).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNy4xMjUuMSIsInVwZGF0ZWRJblZlciI6IjM3LjEyNS4xIiwidGFyZ2V0QnJhbmNoIjoibWFzdGVyIn0=-->

charts/stable/humhub/values.yaml

@@ -1,7 +1,7 @@
 image:
   pullPolicy: IfNotPresent
   repository: ghcr.io/mriedmann/humhub-phponly
-  tag: 1.15.0@sha256:8cbc2f44a64f4e615b425968aea116944a367947e07d092c19e57c6753ff2f9f
+  tag: 1.15.2@sha256:9987a9e856e682c82846512f813b4dc7fb02235190e35ae1727b239f99e99544
 nginxImage:
   pullPolicy: IfNotPresent
   repository: ghcr.io/mriedmann/humhub-nginx