chore(deps): Bump actions/download-artifact from 2 to 4 (#296)

* chore(deps): Bump actions/download-artifact from 2 to 4

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 2 to 4.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v2...v4)

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

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

* ci: Bumps upload artifact as well

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: F-G Fernandez <26927750+frgfm@users.noreply.github.com>

.github/workflows/tests.yml

@@ -35,7 +35,7 @@ jobs:
         run: |
           coverage run -m pytest tests/
           coverage xml
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         with:
           name: coverage-main
           path: ./coverage.xml
@@ -45,7 +45,7 @@ jobs:
     needs: pytest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/download-artifact@v2
+      - uses: actions/download-artifact@v4
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v1
         with: