ci: bump actions/setup-node from 5 to 6

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 5 to 6.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@v5...v6)

---
updated-dependencies:
- dependency-name: actions/setup-node
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Checkout sources
         uses: actions/checkout@v5
       - name: Install Node.js ${{matrix.node-version}}
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: ${{matrix.node-version}}
       - name: Install dependencies
@@ -27,7 +27,7 @@ jobs:
       - name: Checkout sources
         uses: actions/checkout@v5
       - name: Install Node.js
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: lts/*
       - name: Install dependencies
@@ -41,7 +41,7 @@ jobs:
       - name: Checkout sources
         uses: actions/checkout@v5
       - name: Install Node.js
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: lts/*
       - name: Install dependencies