chore: upgrade actions/setup-node to v6 in workflows and documentation

Author: KristjanESPERANTO

.github/workflows/automated-tests.yaml

@@ -16,7 +16,7 @@ jobs:
       - name: Check out repository code
         uses: actions/checkout@v5
       - name: Use Node.js
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: lts/*
           cache: npm

.github/workflows/check-modules-compare.yaml

@@ -22,7 +22,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Use Node.js
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: lts/*
           cache: npm

.github/workflows/release-validation.yml

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

guides/eslint.md

@@ -172,7 +172,7 @@ jobs:
       - run: echo "💡 The ${{ github.repository }} repository has been cloned to the runner."
       - run: echo "🖥️ The workflow is now ready to test your code on the runner."
       - name: Use Node.js
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: lts/*
           cache: npm

scripts/check-modules/rule-registry.js

@@ -270,10 +270,11 @@ const RULE_DEFINITIONS = [
     scope: "text",
     patterns: [
       "uses: actions/setup-node@v3",
-      "uses: actions/setup-node@v4"
+      "uses: actions/setup-node@v4",
+      "uses: actions/setup-node@v5"
     ],
     category: "Recommendation",
-    description: "Upgrade workflows to use actions/setup-node@v5."
+    description: "Upgrade workflows to use actions/setup-node@v6."
   },
   {
     id: "text-deprecated-node-version",