Bump actions/setup-node from 5 to 6 (#6250)

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 5 to 6.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](https://github.com/actions/setup-node/compare/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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/web-build.yml

@@ -38,7 +38,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Setup Node.js
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: ${{matrix.node_version}}
           cache: 'npm'

.github/workflows/web-lint.yml

@@ -21,7 +21,7 @@ jobs:
       uses: actions/checkout@v5
 
     - name: Setup Node.js
-      uses: actions/setup-node@v5
+      uses: actions/setup-node@v6
       with:
         cache: 'npm'
         cache-dependency-path: 'webclient/package-lock.json'