Fix: Use grep directly

Author: localheinz

.github/workflows/ci.yaml

@@ -254,7 +254,7 @@ jobs:
         run: ant phar-snapshot
 
       - name: Check whether PHAR is scoped
-        run: cat build/artifacts/phpunit-snapshot.phar | grep -q PHPUnit\\\\DeepCopy\\\\Exception\\\\CloneException || (echo "phpunit-snapshot.phar is not scoped." && false)
+        run: grep -q PHPUnit\\\\DeepCopy\\\\Exception\\\\CloneException build/artifacts/phpunit-snapshot.phar || (echo "phpunit-snapshot.phar is not scoped." && false)
 
       - name: Upload PHAR
         uses: actions/upload-artifact@v4