Bump actions/setup-node from 4 to 6

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 4 to 6.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@v4...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] <[email protected]>

Author: dependabot[bot]

.github/workflows/lint.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
-    - uses: actions/setup-node@v4
+    - uses: actions/setup-node@v6
       with:
         node-version: "*" # latest
     - run: npm ci

.github/workflows/release.yml

@@ -49,7 +49,7 @@ jobs:
           TAG_PREFIX: refs/tags/ # Optional, default prefix refs/tags/
 
       - name: Use Node.js 20.x
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: 20.x
       - name: Build Node.js package

.github/workflows/tests.js.yml

@@ -26,7 +26,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v4
+      uses: actions/setup-node@v6
       with:
         node-version: ${{ matrix.node-version }}
     - run: npm install