Upgrade to version 2.3.3. As with gwenhyfar, this is the latest release
of the 2.x line, and the author has chosen to no longer host version 3.x
Since our only consumer of this port is gnucash, and gnucash requires
the Qt component of aqbanking (qbanking), I chose to make the qbanking
interface a non-optional decision. In case there might be further
consumers in future, this could perhaps also be made optional.