Update actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
         with:
           path: '**/node_modules'
           key: ${{ runner.os }}-lint-modules-${{ hashFiles('**/yarn.lock') }}
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: 20.x
       - run: yarn install
@@ -30,7 +30,7 @@ jobs:
           - 24.x
     steps:
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
       - name: Ensure line endings are consistent
@@ -77,7 +77,7 @@ jobs:
           - 24.x
     steps:
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
       - name: Check out repository
@@ -102,7 +102,7 @@ jobs:
         with:
           path: '**/node_modules'
           key: ${{ runner.os }}-webpack-modules-${{ hashFiles('**/yarn.lock') }}
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: 20.x
       - run: yarn install