testing/homebank: upgrade to 5.6.4
https://bazaar.launchpad.net/~mdoyen/homebank/5.6.x/view/head:/ChangeLog#L3
unfortunately, no libsoup3 yet
https://bazaar.launchpad.net/~mdoyen/homebank/5.6.x/view/head:/ChangeLog#L3
unfortunately, no libsoup3 yet