chore: update actions/setup-node action to v6

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
       - uses: ankane/setup-mysql@v1
@@ -40,7 +40,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - name: Use Node.js 20
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: 20.19.5
       - name: Bootstrap project
@@ -58,7 +58,7 @@ jobs:
         with:
           fetch-depth: 0
       - name: Use Node.js 20
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: 20.19.5
       - name: Bootstrap project