[bsp/at32] add at32f423-start to auto check workflows

.github/workflows/action.yml

@@ -61,6 +61,7 @@ jobs:
                 - "at32/at32f413-start"
                 - "at32/at32f415-start"
                 - "at32/at32f421-start"
+                - "at32/at32f423-start"
                 - "at32/at32f425-start"
                 - "at32/at32f435-start"
                 - "at32/at32f437-start"