Allow upgrade when using {os_name} in URL (#2974)

Once {os_name} is part of the update URL we also need to set the OS name
explicitly for upgrades: A user might use a new Supervisor version on a
OS release 5 device. The device will still use "hassos" as OS name.
Before introducing {os_name}, the new OS name was part of the URL. Now
when {os_name} is used, we need to adjust the name for upgrade as well.

supervisor/hassos.py

@@ -76,6 +76,8 @@ class HassOS(CoreSysAttributes):
         # The OS name used to be hassos before renaming to haos...
         if version < 6.0:
             update_os_name = "hassos"
+        else:
+            update_os_name = "haos"
 
         url = raw_url.format(
             version=str(version), board=update_board, os_name=update_os_name