Bump actions/setup-node from 3 to 4 in /.github/workflows

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 3 to 4.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](https://github.com/actions/setup-node/compare/v3...v4)

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

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

.github/workflows/build.yml

@@ -15,7 +15,7 @@ jobs:
       - name: checkout code
         uses: actions/checkout@v4
       - name: setup node
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
         with:
           node-version: '16'
           cache: 'npm'

.github/workflows/mocha.yml

@@ -18,7 +18,7 @@ jobs:
         node:
           - 16
     steps:
-      - uses: actions/setup-node@v3
+      - uses: actions/setup-node@v4
         with:
           node-version: '${{ matrix.node }}'
       - uses: actions/checkout@v4