Update Flatpak dependency version
Update the required version of the Flatpak library to 1.15.4, which introduces flatpak_transaction_add_rebase_and_uninstall, used in 370a22da.
Detected because Ubuntu (even 24.04) packages a lower version.
Now I get a nice CMake log prompting me to switch distro, instead of an obscure compiling error.
-- Checking for module 'flatpak>=1.15.4'
-- Package dependency requirement 'flatpak >= 1.15.4' could not be satisfied.
Package 'flatpak' has version '1.14.6', required version is '>= 1.15.4'
Edited by Ismael Asensio