Bump composer

Author: Nyholm

.github/workflows/ci.yaml

@@ -49,7 +49,7 @@ jobs:
             -   name: "Set-up PHP"
                 uses: shivammathur/setup-php@v2
                 with:
-                    php-version: 7.2
+                    php-version: 8.0
                     coverage: none
                     tools: "composer:v2"