Update actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/deploy.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4.3.1
       - name: Setup node
-        uses: actions/setup-node@v4.4.0
+        uses: actions/setup-node@v6.1.0
         with:
           node-version-file: .nvmrc
       - name: Setup cache

.github/workflows/validate.yml

@@ -9,7 +9,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4.3.1
       - name: Set up node.
-        uses: actions/setup-node@v4.4.0
+        uses: actions/setup-node@v6.1.0
         with:
           node-version-file: .nvmrc
       - name: Lint