update icon and add artists credits

src/about.py

@@ -26,6 +26,10 @@ developers = [
     "Vladimir Vaskov <rirusha@altlinux.org>"
 ]
 
+artists = [
+    "GNOME Design https://gitlab.gnome.org/Teams/Design/"
+]
+
 def build_about_dialog() -> Adw.AboutDialog:
     about = Adw.AboutDialog(
         application_name='tuneit',
@@ -33,6 +37,7 @@ def build_about_dialog() -> Adw.AboutDialog:
         developer_name='Etersoft',
         version=tuneit_config.VERSION,
         developers=developers,
+        artists=artists,
         copyright='© 2024-2025 Etersoft',
         license_type=Gtk.License.GPL_3_0
     )