Attemp to fix composer autoloading in CI

Author: JasonTame

.github/workflows/run-tests.yml

@@ -52,6 +52,7 @@ jobs:
         run: |
           composer require "laravel/framework:${{ matrix.laravel }}" "orchestra/testbench:${{ matrix.testbench }}" --no-interaction --no-update
           composer update --${{ matrix.stability }} --prefer-dist --no-interaction
+          composer dump-autoload
 
       - name: List Installed Dependencies
         run: composer show -D