Update paperless-ngx to version 0.25.6

Updated the Chart.yaml and README.md files for the
paperless-ngx Helm chart to reflect the new version
0.25.6. This change is necessary to ensure that users
are aware of the latest updates and improvements in
the software. The appVersion remains at 2.20.0, and
the kubeVersion is still set to ">=1.28.0-0". The
README badge for the version has also been updated
to maintain consistency and inform users of the
current version being used.

charts/paperless-ngx/Chart.yaml

@@ -4,7 +4,7 @@ description: "A community-supported supercharged version of paperless: scan, ind
 home: https://charts.gabe565.com/charts/paperless-ngx/
 icon: https://raw.githubusercontent.com/paperless-ngx/paperless-ngx/b948750/src-ui/src/assets/logo-notext.svg
 type: application
-version: 0.25.1
+version: 0.25.6
 # renovate datasource=docker depName=ghcr.io/paperless-ngx/paperless-ngx
 appVersion: 2.20.0
 kubeVersion: ">=1.28.0-0"