Early preview of .Net8 builds, codename `2.0.8.105`

[ts678]

@hermankopinga

The libicu library for Ubuntu 24.04 seems to be libicu74. So adding that dependency should fix this.

@kenkendk

@ts678

Linux Mint 20, in support for another year. Based on Ubuntu 20.04 which I think has libicu66, however I also seem to have libicu60 somehow. Duplicati apt show seems to want libicu70 | libicu71 | libicu72.

That was a bit of a rabbit hole, but I have added support for many old versions of libicu now, but it will break in the future :'(.

I guess the future has arrived.