Update actions/setup-node action to v6

Author: xdev-renovate

.github/workflows/antora-build.yml

@@ -24,7 +24,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Install Node.js
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: 22
 

.github/workflows/check-build.yml

@@ -163,7 +163,7 @@ jobs:
       - uses: actions/checkout@v5
 
       - name: Install Node.js
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: 22