Remove overwrite from upload-artifact (#97)

It appears this is causing some wheels to not get uploaded to pypi.

.github/workflows/build.yml

@@ -42,8 +42,8 @@ jobs:
     - uses: pypa/[email protected]
     - uses: actions/upload-artifact@v4
       with:
+        name: artifact-wheel-${{ matrix.os }}
         path: wheelhouse/*.whl
-        overwrite: true
 
   make_sdist:
     runs-on: "ubuntu-latest"
@@ -54,11 +54,22 @@ jobs:
         python -m build --no-isolation --sdist
     - uses: actions/upload-artifact@v4
       with:
+        name: artifact-sdist
         path: dist/*.tar.gz
-        overwrite: true
 
-  upload_all:
+  merge:
+    runs-on: ubuntu-latest
     needs: [build_wheels, make_sdist]
+    steps:
+      - name: Merge Artifacts
+        uses: actions/upload-artifact/merge@v4
+        with:
+          name: artifact
+          pattern: artifact-*
+          delete-merged: true
+
+  upload_all:
+    needs: merge
     runs-on: "ubuntu-latest"
     environment: release
     if: github.event_name == 'release' && github.event.action == 'published'