Update GH action

Author: nicksagona

.github/workflows/phpunit.yml

@@ -32,6 +32,7 @@ jobs:
         uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php-versions }}
+          extensions: imap
           tools: phpunit:${{ matrix.phpunit-versions }}
 
       #- name: Validate composer.json and composer.lock