fix: pypi-release-action: downgrade upload-artifact and download-artifact to v3 (#938)

Since there are breaking changes between the upload-artifact and download-artifact versions v3 and v4, this workflow was broken, and no releases were uploaded to pypi.
A downgrade should make this work again

Author: tobiasmicheler

.github/workflows/release_to_pypi.yml

@@ -23,7 +23,7 @@ jobs:
           sccache: 'true'
           manylinux: auto
       - name: Upload wheels
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: wheels
           path: dist
@@ -42,7 +42,7 @@ jobs:
           args: --release --out dist
           sccache: 'true'
       - name: Upload wheels
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: wheels
           path: dist
@@ -61,7 +61,7 @@ jobs:
           args: --release --out dist
           sccache: 'true'
       - name: Upload wheels
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: wheels
           path: dist
@@ -76,7 +76,7 @@ jobs:
           command: sdist
           args: --out dist
       - name: Upload sdist
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: wheels
           path: dist
@@ -87,7 +87,7 @@ jobs:
     if: "startsWith(github.ref, 'refs/tags/')"
     needs: [linux, windows, macos, sdist]
     steps:
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v3
         with:
           name: wheels
       - name: Publish to PyPI