Fix build release job following actions v4 upgrade

Author: relf

.github/workflows/build_release.yml

@@ -24,6 +24,7 @@ jobs:
 
       - uses: actions/upload-artifact@v4
         with:
+          name: smt-${{ matrix.os }}
           path: ./wheelhouse/*.whl
 
   build_sdist:
@@ -37,6 +38,7 @@ jobs:
 
       - uses: actions/upload-artifact@v4
         with:
+          name: smt-src
           path: dist/*.tar.gz
 
   upload_pypi:
@@ -48,9 +50,8 @@ jobs:
     steps:
       - uses: actions/download-artifact@v4
         with:
-          # unpacks default artifact into dist/
-          # if `name: artifact` is omitted, the action will create extra parent dir
-          name: artifact
+          pattern: smt-*
+          merge-multiple: true
           path: dist
 
       - uses: pypa/gh-action-pypi-publish@release/v1