GHA: upload immutable artifacts

Author: wjakob

.github/workflows/wheels.yml

@@ -25,7 +25,7 @@ jobs:
     - name: Check metadata
       run: pipx run twine check dist/*
 
-    - uses: actions/upload-artifact@v3
+    - uses: actions/upload-artifact@v4
       with:
         path: dist/*.tar.gz
 
@@ -56,9 +56,10 @@ jobs:
       shell: bash
 
     - name: Upload wheels
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         path: wheelhouse/*.whl
+        name: dist-${{ matrix.os }}
 
 
   upload_all:
@@ -72,7 +73,8 @@ jobs:
 
     - uses: actions/download-artifact@v4
       with:
-        name: artifact
+        merge-multiple: true
+        pattern: dist-*
         path: dist
 
     - uses: pypa/gh-action-pypi-publish@release/v1