Add PPA support for Ubuntu 23.04

[ryanfantus]

Hi Frode, not sure if this is the right place to file an issue like this but I am using Ubuntu 23.04 and python3-lhafile won't install from your PPA due to Ubuntu 23.04 shipping with Python 3.11. Any chance you could support 23.04 with your PPAs?

[soydemadrid]

I've got the same trouble. The Snap install is also broken in 23.04 currently.

[3vi1]

Same issue with the 23.10 (Mantic Minotaur) beta:

python3-lhafile : Depends: python3 (< 3.11) but 3.11.4-5 is to be installed