Update Github Actions

Author: casperbakker

.github/workflows/phpunit.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:

.gitignore

@@ -3,3 +3,4 @@ composer.lock
 vendor/
 phpunit.xml
 .idea
+.phpunit.result.cache