Datapusher unable to handle XLSX files contrary to documentation

I found this [closed post](https://github.com/ckan/ckan-docker/issues/62) as I have hit the same issue with the same error when uploading an xlsx file in dockerised CKAN v2.10.4.

However, the datapusher documentation https://docs.ckan.org/en/2.10/maintaining/configuration.html#ckan-datapusher-formats states that xlsx is supported:

`ckan.datapusher.formats
Default value: csv xls xlsx tsv application/csv application/vnd.ms-excel application/vnd.openxmlformats-officedocument.spreadsheetml.sheet ods application/vnd.oasis.opendocument.spreadsheet`

Should the documentation be revised?

I found reference to datapusher-plus as a possible alternative that does support xlsx. Is there a plan to package this in the next stable release of the dockerised version?