Update release.yaml to work with new upload/download

actions/upload-artifact and actions/download-artifact both were updated with breaking changes which caused release.yaml not to run anymore. This attempts to fix the release mechanism to working order again.

Key change is that upload-artifact must now use unique names and dowload-artifact must be changed to merge all files into a single directory for twine to pick up.

.github/workflows/release.yaml

@@ -113,6 +113,7 @@ jobs:
 
       - uses: actions/upload-artifact@v4
         with:
+          name: artifact-py3.${{ matrix.python-version }}-${{ matrix.os }}
           path: ./dist/*
 
   release:
@@ -122,6 +123,9 @@ jobs:
     steps:
       - name: download files
         uses: actions/download-artifact@v4
+        with:
+          merge-multiple: true
+          path: artifact
 
       - name: set up Python 3.10
         uses: actions/setup-python@v4