Update actions/setup-node action to v4 (#14)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/test.yml

@@ -86,7 +86,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Use Node.js 21.x
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
         with:
           node-version: 21.x
 
@@ -102,7 +102,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Use Node.js 21.x
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
         with:
           node-version: 21.x