Bump actions/download-artifact from 5 to 6 in /.github/workflows (#167)

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Author: dependabot[bot]

.github/workflows/publish.yml

@@ -86,7 +86,7 @@ jobs:
     permissions:
       id-token: write # for PyPI trusted publishing
     steps:
-      - uses: actions/download-artifact@v5
+      - uses: actions/download-artifact@v6
         with:
           name: dist
           path: dist/