config: Update to gnome-42 branch

src/config.rs

 pub const ABSOLUTE_BASE_URL: &str = "https://apps.gnome.org";
-pub const GNOME_RELEASE: &str = "master";
+pub const GNOME_RELEASE: &str = "gnome-42";
 
 pub const PAGES_PATH: &str = "/apps-for-gnome";