Add PHP 8.5 support, fix coverage warnings, ensure Pest 4/PHPUnit 12

Author: freekmurze

.github/workflows/run-tests.yml

@@ -12,7 +12,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest]
-        php: [8.4, 8.3]
+        php: [8.5, 8.4, 8.3]
         laravel: ['9.*', '10.*', '11.*', '12.*', '13.*']
         dependency-version: [prefer-stable]
         include:
@@ -46,6 +46,7 @@ jobs:
           echo "::add-matcher::${{ runner.tool_cache }}/phpunit.json"
 
       - name: Install dependencies
+        shell: bash
         run: |
           composer require "laravel/framework:${{ matrix.laravel }}" "orchestra/testbench:${{ matrix.testbench }}" --no-interaction --no-update
           composer update --${{ matrix.dependency-version }} --prefer-dist --no-interaction