test php8

Author: okbang9

.github/workflows/test-ci.yml

@@ -11,7 +11,7 @@ jobs:
       fail-fast: false
       max-parallel: 1
       matrix:
-        php-versions: ['8.0']
+        php-versions: ['8.0.0']
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -32,7 +32,7 @@ jobs:
         if: ${{ matrix.php-versions == '8.0' }}
         run: |
           echo ${{ matrix.php-versions }}
-          composer require phpunit/phpunit=8.0.0
+          composer require phpunit/phpunit=9.0.0
           composer install --no-interaction --prefer-source --dev