fedora: Change default release to rawhide

Fedora releases new versions quite regularly, sometimes more regularly
than we do mkosi releases. This means that users on the latest official
mkosi release can end up building EOL fedora releases because the default
release will be the latest fedora release at the time of the mkosi release
which might be EOL already. Let's switch to rawhide as the default release
so users are guaranteed to get something recent regardless of how old their
mkosi version is.

This matches what we already do for debian, opensuse, arch and other distros.

Author: DaanDeMeyer

mkosi/distributions/fedora.py

@@ -107,7 +107,7 @@ def package_type(cls) -> PackageType:
 
     @classmethod
     def default_release(cls) -> str:
-        return "41"
+        return "rawhide"
 
     @classmethod
     def grub_prefix(cls) -> str: