Revert "Bump actions/upload-artifact from 3 to 4 (#774)"

This reverts commit 180105e.

Author: cclauss

.github/workflows/build.yml

@@ -29,7 +29,7 @@ jobs:
       run: python3 -m build
 
     - name: Store the distribution packages
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v3
       with:
         name: python-package-distributions
         path: dist/