Bump actions/download-artifact from 2 to 4.1.7 in /.github/workflows

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 2 to 4.1.7.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v2...v4.1.7)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-type: direct:production
...

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

.github/workflows/ci-spec.yml

@@ -79,17 +79,17 @@ jobs:
       - name: Create output directory
         run: mkdir _output && cp document/index.html _output/index.html
       - name: Download core spec artifact
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v4.1.7
         with:
           name: core-rendered
           path: _output/core
       - name: Download JS API spec artifact
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v4.1.7
         with:
           name: js-api-rendered
           path: _output/js-api
       - name: Download Web API spec artifact
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v4.1.7
         with:
           name: web-api-rendered
           path: _output/web-api