chore(package): update ghcr.io/paperless-ngx/paperless-ngx docker tag to v2.18.4

| datasource | package                             | from   | to     |
| ---------- | ----------------------------------- | ------ | ------ |
| docker     | ghcr.io/paperless-ngx/paperless-ngx | 2.18.3 | 2.18.4 |

Author: renovate[bot]

kustomization/components/paperless/kustomization.yml

@@ -3,7 +3,7 @@ kind: Component
 
 images:
   - name: ghcr.io/paperless-ngx/paperless-ngx
-    newTag: 2.18.3@sha256:6dbe57d8198fa117158ba9e867e2d45280b65e9c37ea54c1df7b34c4085a564c
+    newTag: 2.18.4@sha256:3421ebe06ed27662d014046cf5089e612de853aae0c676a2bc72f73b38080e57
   - name: ghcr.io/servercontainers/samba:smbd-only-latest
     digest: sha256:3853c448d8a391be21ce9509607607572a9b79ad47973e36bd4b62ad824b15d1
 resources: