fix(ci): use correct node version in unit tests

Author: Ernxst

.github/workflows/ci.yml

@@ -61,6 +61,11 @@ jobs:
       - name: ⬇️ Checkout repo
         uses: actions/checkout@v4
 
+      - name: 📤 Setup Node ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+          
       - name: 📤 Install Bun
         uses: oven-sh/setup-bun@v1
         with: