chore(deps): bump actions/download-artifact from 3 to 4 (#90)

* chore(deps): bump actions/download-artifact from 3 to 4

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v3...v4)

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

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

* chore(ci): update upload-artifact / follow migration doc

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Oleksii Shmalko <[email protected]>

.github/workflows/publish.yml

@@ -192,9 +192,9 @@ jobs:
           echo "gem-path=ruby-sdk/$(find pkg -name '*-${{ matrix._.platform }}.gem')" >> $GITHUB_OUTPUT
 
       - name: Upload the cross-compiled gems
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
-          name: cross-gem
+          name: cross-gem-${{ matrix._.platform }}
           path: ${{ steps.set-outputs.outputs.gem-path }}
 
   publish_ruby:
@@ -217,9 +217,10 @@ jobs:
           ruby-version: '3.3'
 
       - name: Download the cross-compiled gems
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
-          name: cross-gem
+          pattern: cross-gem-*
+          merge-multiple: true
 
       - name: Check Cargo.lock
         # Ensure that Cargo.lock matches Cargo.toml