Update test.yml

Author: tmcw

.github/workflows/test.yml

@@ -16,14 +16,21 @@ jobs:
     steps:
       - name: Checkout repo
         uses: actions/checkout@v4
+        
+      - uses: pnpm/action-setup@v4
+        name: Install pnpm
+        with:
+          version: 9
+          run_install: false
 
       - name: Setup Node
         uses: actions/setup-node@v4
         with:
           node-version: 20
+          cache: 'pnpm'
 
       - name: Install dependencies
-        uses: bahmutov/npm-install@v1
+        run: pnpm install
 
       - run: npm run typecheck
       - run: npm run test