Fix artifact download path for publish workflow

It turns out that if you don't specify a specific artifact name to
download-artifact, it creates subdirectories for each artifact, which
then confuses the pypi publish action.

.github/workflows/publish.yml

@@ -26,6 +26,7 @@ jobs:
         run: python -m hatch build
       - uses: actions/upload-artifact@v4
         with:
+          name: dist
           path: dist/
           if-no-files-found: error
 
@@ -40,6 +41,7 @@ jobs:
     steps:
       - uses: actions/download-artifact@v4
         with:
+          name: dist
           path: dist
       - name: Push package distributions to PyPI
         uses: pypa/gh-action-pypi-publish@v1.8.14