build(deps): bump paperless-ngx/paperless-ngx

Bumps [paperless-ngx/paperless-ngx](https://github.com/paperless-ngx/paperless-ngx) from 2.18.2 to 2.18.4.
- [Release notes](https://github.com/paperless-ngx/paperless-ngx/releases)
- [Changelog](https://github.com/paperless-ngx/paperless-ngx/blob/dev/docs/changelog.md)
- [Commits](https://github.com/paperless-ngx/paperless-ngx/compare/v2.18.2...v2.18.4)

---
updated-dependencies:
- dependency-name: paperless-ngx/paperless-ngx
  dependency-version: 2.18.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

docker/personal/paperless/docker-compose.yml

@@ -16,7 +16,7 @@ services:
       POSTGRES_DB: paperless
 
   paperless-webserver:
-    image: ghcr.io/paperless-ngx/paperless-ngx:2.18.2
+    image: ghcr.io/paperless-ngx/paperless-ngx:2.18.4
     restart: unless-stopped
     networks:
       - default