Raise minimum required version of AqBanking5.0
the German online banking users have to use a registered software from
mid-September onwards and the institutions are allowed according to EU
regulations to reject/refuse access by non-registered client
applications.
To be able to support this process KMyMoney requires a newer version of
AqBanking which has been released lately.
Backported from commit cd00fe960c70c6cd905cdafc2575598020bfbbc6.
CCBUG:410865