ci/cd(deps): bump actions/download-artifact from 4.1.0 to 4.1.9

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 4.1.0 to 4.1.9.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v4.1.0...v4.1.9)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/cd.docs.cfp.yml

@@ -63,7 +63,7 @@ jobs:
 
     steps:
       - name: Fetch the site
-        uses: actions/[email protected].0
+        uses: actions/[email protected].9
         with:
           name: dist
           path: docs/dist/

.github/workflows/ci.yml

@@ -111,7 +111,7 @@ jobs:
         with: { fetch-depth: 0 }
 
       - name: Fetch code coverage report
-        uses: actions/[email protected].0
+        uses: actions/[email protected].9
         with: { name: code-coverage-report }
       - name: Send code coverage report to Codecov (codecov.io)
         uses: codecov/[email protected]