chore(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/gh_pkg.yaml

@@ -18,7 +18,7 @@ jobs:
       - uses: actions/checkout@v5
 
       # .npmrc ファイルをセットアップして GitHub Packages に公開する
-      - uses: actions/setup-node@v5
+      - uses: actions/setup-node@v6
         with:
           node-version: '18.x'
           registry-url: 'https://npm.pkg.github.com'

.github/workflows/npm_pkg.yaml

@@ -30,7 +30,7 @@ jobs:
       - uses: actions/checkout@v5
 
       # npm に公開するように .npmrc ファイルを設定する
-      - uses: actions/setup-node@v5
+      - uses: actions/setup-node@v6
         with:
           node-version: '18.x'
           registry-url: 'https://registry.npmjs.org'

.github/workflows/test.yaml

@@ -20,7 +20,7 @@ jobs:
       - 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 }}