Use ramsey/composer-install action v3 (#21)

Author: OskarStark

.github/workflows/ci.yaml

@@ -79,7 +79,7 @@ jobs:
               run: composer require ${{ matrix.variant }} --no-update
 
             - name: Install Composer dependencies (${{ matrix.dependencies }})
-              uses: ramsey/composer-install@v2
+              uses: ramsey/composer-install@v3
               with:
                   dependency-versions: ${{ matrix.dependencies }}