chore(deps): update actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/main.yaml

@@ -7,7 +7,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - name: Use Node.js 20
-      uses: actions/setup-node@v4
+      uses: actions/setup-node@v6
       with:
         node-version: 20
     - run: npm ci

.github/workflows/tests.yaml

@@ -14,7 +14,7 @@ jobs:
         uses: actions/checkout@v3
 
       - name: Setup Node.js
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v6
         with:
           node-version: 18