chore(helm): update humhub (#34244)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| ghcr.io/mriedmann/humhub-nginx | digest | `be7d9cc` -> `334f067` |
|
[ghcr.io/mriedmann/humhub-phponly](https://redirect.github.com/mriedmann/humhub-docker)
| digest | `59b1ce5` -> `2a2640e` |

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to pin your dependencies.

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charts/stable/humhub/Chart.yaml

@@ -50,5 +50,5 @@ sources:
   - https://ghcr.io/mriedmann/humhub-phponly
   - https://github.com/truecharts/charts/tree/master/charts/stable/humhub
 type: application
-version: 9.18.2
+version: 9.18.4
 

charts/stable/humhub/values.yaml

@@ -1,11 +1,11 @@
 image:
   pullPolicy: IfNotPresent
   repository: ghcr.io/mriedmann/humhub-phponly
-  tag: 1.17.1@sha256:59b1ce5ee0528c3631fcb643a7b376397f458bd8faab6d41b710785eaa22c816
+  tag: 1.17.1@sha256:2a2640e7275a7963d0f0059d331bca8936c66d9ed143f50201b8fc4b20098c45
 nginxImage:
   pullPolicy: IfNotPresent
   repository: ghcr.io/mriedmann/humhub-nginx
-  tag: 1.17.1@sha256:be7d9cc3a7ba90def47ef5998bb459886a06aad0d5777b6bcd82cdd304f735ee
+  tag: 1.17.1@sha256:334f067e290db7b61396d75a2f7a6c6fb5557668b2c0fe539d5dcbe0415d2aaa
 
 securityContext:
   container: