[$] Readying DNF5 for Fedora 41

With the release of Fedora40 it's time tostart looking ahead to what Fedora41 has in store. One of the largestchanges planned for the next release is a switch toDNF5, a C++ rewrite of the DNFpackage manager. A previous attempt to make the switch, during the Fedora39 cycle, was called off, anddeferred to Fedora41. The developers have had nearly a year to addresscompatibility problems and bring DNF5 to a state suitable to replace DNF4. Signs point to a successful switch inthe upcoming release, though there may be a few surprises lurking for Fedora users.