External Version bump for archlinux new version string "2021.09.01"

roles/netbootxyz/defaults/main.yml

@@ -132,8 +132,8 @@ releases:
     mirror: mirrors.kernel.org
     name: Arch Linux
     versions:
-    - code_name: 2021.08.01
-      name: 2021.08.01
+    - code_name: 2021.09.01
+      name: 2021.09.01
   blackarch:
     enabled: true
     menu: linux