chore(paperless-ngx): update to version 2.20.1

Update Paperless-ngx chart version to 0.25.11 and application version to
 2.20.1. This updates the Docker image tag in both Chart.yaml and
 values.yaml files to ensure consistency across the deployment. This is a
 minor version update that likely includes bug fixes and improvements from
 the upstream Paperless-ngx project.

charts/paperless-ngx/values.yaml

@@ -15,7 +15,7 @@ controllers:
           # -- Image pull policy
           pullPolicy: IfNotPresent
           # -- Image tag
-          tag: 2.20.0
+          tag: 2.20.1
           # -- Environment variables [[ref]](https://docs.paperless-ngx.com/configuration/)
           # @default -- See [values.yaml](./values.yaml)
         # -- Set the resource requests / limits for the container.