Add "application/zip" to "allowed-mime-types" in dbp-file-source

Local test is ok, not sure if this mime type is sufficient (application/octet-stream ?)

added Bug label

This is already handled here: https://gitlab.tugraz.at/dbp/web-components/toolkit/-/blob/08cd88a9b00d26f2b708a4044f55de1244243c8e/packages/file-handling/src/file-source.js#L400

So if this changes something then there is a bug somewhere else.

Since this turned out to be a different issue, closing.

closed