[CI]: Bump dawidd6/action-download-artifact from 5 to 6

Bumps [dawidd6/action-download-artifact](https://github.com/dawidd6/action-download-artifact) from 5 to 6.
- [Release notes](https://github.com/dawidd6/action-download-artifact/releases)
- [Commits](dawidd6/action-download-artifact@v5...v6)

---
updated-dependencies:
- dependency-name: dawidd6/action-download-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/deploy-pypi.yml

@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Download wheels from commit ${{ github.sha }}
-        uses: dawidd6/action-download-artifact@v5
+        uses: dawidd6/action-download-artifact@v6
         with:
           workflow: build-wheels.yml
           workflow_conclusion: success
@@ -41,7 +41,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Download wheels from commit ${{ github.sha }}
-        uses: dawidd6/action-download-artifact@v5
+        uses: dawidd6/action-download-artifact@v6
         with:
           workflow: build-wheels.yml
           workflow_conclusion: success