Bump immich-app/immich-server from v2.4.1 to v2.5.6 in /projects/immich

Bumps [immich-app/immich-server](https://github.com/immich-app/immich) from v2.4.1 to v2.5.6.
- [Release notes](https://github.com/immich-app/immich/releases)
- [Commits](https://github.com/immich-app/immich/compare/v2.4.1...v2.5.6)

---
updated-dependencies:
- dependency-name: immich-app/immich-server
  dependency-version: v2.5.6
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

projects/immich/docker-compose.yml

@@ -2,7 +2,7 @@ version: "3.9"
 
 services:
   immich-server:
-    image: ghcr.io/immich-app/immich-server:v2.4.1
+    image: ghcr.io/immich-app/immich-server:v2.5.6
     labels:
       - rclone.storage=storagebox-crypt
     volumes: