Bump actions/download-artifact from 2 to 3 (#95)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 2 to 3.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v2...v3)

---
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>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/elixir.yml

@@ -205,7 +205,7 @@ jobs:
             compile_dev-${{ secrets.CACHE_VERSION }}-${{ steps.setup-elixir.outputs.otp-version }}-${{ steps.setup-elixir.outputs.elixir-version }}-
       - run: mix deps.compile --skip-umbrella-children
       - run: mix compile --warning-as-errors
-      - uses: actions/download-artifact@v2
+      - uses: actions/download-artifact@v3
         with:
           name: dialyzer_plt_dev-${{ steps.setup-elixir.outputs.otp-version }}-${{ steps.setup-elixir.outputs.elixir-version }}
           path: priv/plts/