Bump actions/setup-node from 5 to 6 (#351)

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Set up Node.js 18.x
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: 18.x
           cache: 'npm'
@@ -35,7 +35,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Set up Node.js 18.x
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: 18.x
           cache: 'npm'