Update actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/main.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v5
       - name: Setup node
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: 24
 

.github/workflows/setup.yml

@@ -22,7 +22,7 @@ jobs:
       BACKUP_AUTH0_SECRET: ${{ steps.set-vars.outputs.BACKUP_AUTH0_SECRET }}
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-node@v5
+      - uses: actions/setup-node@v6
         with:
           node-version: 24
           cache: 'npm'
@@ -69,7 +69,7 @@ jobs:
     needs: setup
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-node@v5
+      - uses: actions/setup-node@v6
         with:
           node-version: 24
 
@@ -105,7 +105,7 @@ jobs:
       AUTH0_CONNECTION: ${{ vars.AUTH0_CONNECTION }}
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-node@v5
+      - uses: actions/setup-node@v6
         with:
           node-version: 24