[php-laravel] Upgrade php-laravel to 7.x (#6346)

* Update laravel from 5.6 to 7.0

* Updated petstore example, removed missing files

* Updated PHP version to match composer.json

* Add samples generation config with OAS3 input spec

* Fixed gitignore compile errors, updated to newest petstore example

* Add composer.lock to .gitignore

* Fix generator gitignore location

* Add integration tests

* Refresh samples

Co-authored-by: Yuriy Belenko <yura-bely@mail.ru>

samples/server/petstore/php-laravel/lib/config/broadcasting.php

@@ -37,7 +37,7 @@ return [
             'app_id' => env('PUSHER_APP_ID'),
             'options' => [
                 'cluster' => env('PUSHER_APP_CLUSTER'),
-                'encrypted' => true,
+                'useTLS' => true,
             ],
         ],