Update actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/dry-run.yml

@@ -13,7 +13,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Install Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version-file: ".node-version"
 

auto_update_github_action.yml

@@ -26,7 +26,7 @@ jobs:
           ref: "v1"
 
       - name: Install Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version-file: ".node-version"