build(deps): 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.yaml

@@ -13,7 +13,7 @@ jobs:
         node: [14, 18, 20, 22, 24]
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-node@v5
+      - uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node }}
       # The test/babel-8 workspace depends on Babel 8, which requires Node 20+,
@@ -33,7 +33,7 @@ jobs:
     runs-on: windows-latest
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-node@v5
+      - uses: actions/setup-node@v6
         with:
           node-version: lts/*
       - run: npm install

.github/workflows/release-please.yml

@@ -22,7 +22,7 @@ jobs:
         env:
           FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true
       - uses: actions/checkout@v5
-      - uses: actions/setup-node@v5
+      - uses: actions/setup-node@v6
         with:
           node-version: lts/*
           registry-url: 'https://registry.npmjs.org'