[onedrive] Update to 2.4.20 and use upstream docker image

Description of the change

This updates the app to 2.4.20 and replaces my image with the upstream image.

Benefits

I don't have to build the image anymore, upstream supports arm now!

Possible drawbacks

None known.

Applicable issues

N/A

Additional information

N/A

Checklist

[X] Title of the PR starts with chart name (e.g. [home-assistant])
[X] Chart version bumped in Chart.yaml according to semver.
[X] Chart artifacthub.io/changes changelog annotation has been updated in Chart.yaml. See Artifact Hub documentation for more info.
[X] Variables have been documented in the values.yaml file.

k8s-at-home / charts