github/workflows/publish: fix artifact upload

Make recommended changes to the artifact upload and download steps
as suggested by https://github.com/actions/upload-artifact/blob/main/docs/MIGRATION.md

Author: dlech

.github/workflows/publish.yml

@@ -37,6 +37,7 @@ jobs:
 
       - uses: actions/upload-artifact@v4
         with:
+          name: artifact-${{ matrix.os }}
           path: ./wheelhouse/*.whl
 
   build_sdist:
@@ -52,6 +53,7 @@ jobs:
 
       - uses: actions/upload-artifact@v4
         with:
+          name: artifact-source
           path: dist/*.tar.gz
 
   upload_pypi:
@@ -62,7 +64,8 @@ jobs:
     steps:
       - uses: actions/download-artifact@v4
         with:
-          name: artifact
+          pattern: artifact-*
+          merge-multiple: true
           path: dist
 
       - uses: pypa/[email protected]