Remove npm cache in github action setup as we don't actually use one.

.github/workflows/test.yml

@@ -18,16 +18,10 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Install devbox
-        uses: jetify-com/devbox-install-action@v0.11.0
+        uses: jetify-com/devbox-install-action@v0.12.0
         with:
           enable-cache: true
 
-      - name: Cache npm cache
-        uses: actions/cache@v4
-        with:
-          path: ~/.npm
-          key: ${{ runner.os }}-npm
-
       - name: Verify formatting
         run: devbox run format:check