fix: Download dependencies in GitHub Actions before linter

Author: JordanViknar

.github/workflows/check.yml

@@ -8,5 +8,7 @@ jobs:
     steps:
     - name: Checkout repository
       uses: actions/checkout@v4
+    - name: Install dependencies
+      run: npm install
     - name: XO Lint
       run: npx xo