Revert to latest php version

Author: Greg Bowler

.github/workflows/ci.yml

@@ -12,7 +12,6 @@ jobs:
       - name: PHPUnit Tests
         uses: php-actions/phpunit@17-php-versions
         with:
-          php_version: "8.0"
           bootstrap: vendor/autoload.php
           configuration: test/phpunit.xml
           args: --coverage-text