chore(deps): update dependency nextcloud/server to v28.0.11 (#6101)

Signed-off-by: milkmaker <milkmaker@mailcow.de>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

helper-scripts/nextcloud.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 # renovate: datasource=github-releases depName=nextcloud/server versioning=semver extractVersion=^v(?<version>.*)$
-NEXTCLOUD_VERSION=28.0.6
+NEXTCLOUD_VERSION=28.0.11
 
 display_warning() {
     local message=("$@")