Fix end date of char banners

Author: Tibowl

src/data/events.json

@@ -1335,7 +1335,7 @@
         "img": "https://upload-os-bbs.hoyolab.com/upload/2022/05/28/1015537/8b986bca2c84ec70d1982ee3ffd2af50_4941937438722186212.jpg",
         "start": "2022-05-31 11:00:00",
         "start_server": false,
-        "end": "2022-06-20 17:59:00",
+        "end": "2022-06-21 17:59:00",
         "reminder": "end"
     },
     {
@@ -1345,7 +1345,7 @@
         "img": "https://upload-os-bbs.hoyolab.com/upload/2022/05/28/1015537/11a53e952847a294dc27bba1e285c2ef_5391019816687823340.jpg",
         "start": "2022-05-31 11:00:00",
         "start_server": false,
-        "end": "2022-06-20 17:59:00",
+        "end": "2022-06-21 17:59:00",
         "reminder": "end"
     },
     {