Fix config file copy command in workflow

Author: isaachilly

.github/workflows/.gh-action.yml

@@ -20,7 +20,7 @@ jobs:
         uses: actions/setup-node@v3
         with:
           node-version: '22.x'
-      - run: (cd 5-6-7-Exercises; cp config.default.js config.js)
+      - run: (cd 5-6-7-Exercises; cp config-default.js config.js)
       - run: (cd 2-3-4-Exercises; npm ci)
       - run: (cd 2-3-4-Exercises; npm test)
       - run: (cd 5-6-7-Exercises; npm run coverage)