upgrade to laravel 8.0

vendor/laravel/ui/src/Presets/bootstrap-stubs/bootstrap.js

@@ -1,15 +1,6 @@
 window._ = require('lodash');
 
-/**
- * We'll load jQuery and the Bootstrap jQuery plugin which provides support
- * for JavaScript based Bootstrap features such as modals and tabs. This
- * code may be modified to fit the specific needs of your application.
- */
-
 try {
-    window.Popper = require('popper.js').default;
-    window.$ = window.jQuery = require('jquery');
-
     require('bootstrap');
 } catch (e) {}