ci: fix composer version

Fix composer version.

#15

Author: josantonius

.github/workflows/ci.yml

@@ -56,7 +56,7 @@ jobs:
         with:
           php-version: '${{ matrix.php }}'
           coverage: 'none'
-          tools: 'composer:v6'
+          tools: 'composer:v2'
 
       - name: 'Install dependencies'
         run: |
@@ -77,7 +77,7 @@ jobs:
         uses: 'shivammathur/setup-php@v2'
         with:
           php-version: '8.1'
-          tools: 'composer:v6'
+          tools: 'composer:v2'
 
       - name: 'Install dependencies'
         run: |