GitHub ActionsのPHPバージョンを7.3に固定(ActionsデフォルトのPHPバージョンが8になったため)

Author: SofPyon

.github/workflows/release.yml

@@ -13,6 +13,8 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
+      - name: Setup PHP
+        run: sudo update-alternatives --set php /usr/bin/php7.3
       # Composer Cache
       # - name: Get Composer Cache Directory
       #   id: composer-cache