update phpexcel

Author: toyi

composer.json

@@ -17,9 +17,15 @@
       "email": "patrick@maatwebsite.nl"
     }
   ],
+  "repositories": [
+    {
+      "type": "github",
+      "url": "https://github.com/toyi/PHPExcel"
+    }
+  ],
   "require": {
     "php": ">=7.2",
-    "phpoffice/phpexcel": "^1.8.1",
+    "phpoffice/phpexcel": "1.8.3",
     "illuminate/cache": "^5.0|^6.0|^7.0|^8.0",
     "illuminate/config": "^5.0|^6.0|^7.0|^8.0",
     "illuminate/filesystem": "^5.0|^6.0|^7.0|^8.0",