chore(deps): bump actions/download-artifact from 5 to 6

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v5...v6)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  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/code-health.yml

@@ -106,17 +106,17 @@ jobs:
       - name: Install dependencies
         run: npm ci
       - name: Download test results
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: test-results
           path: coverage/mongodb
       - name: Download atlas test results
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: atlas-test-results
           path: coverage/atlas
       - name: Download atlas local test results
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: atlas-local-test-results
           path: coverage/atlas-local