Improve Dasharo (coreboot+SeaBIOS) for QEMU Q35 release process

[pietrushnic]

Since it is mainly for testing, I will keep it in the PC Engines milestone for now. The following task list was made based on Dasharo (coreboot+SeaBIOS) for QEMU Q35 v24.08.00.01-rc1 pre-release.

• improve version bumping both for rc as well as for all other version levels
• make a proper Dasharo release