update actions/upload-artifact and actions/download-artifact (#17)

Author: rokostik

.github/workflows/publish.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Build a binary wheel and a source tarball
         run: python3 -m build
       - name: Store the distribution packages
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: python-package-distributions
           path: dist/
@@ -39,7 +39,7 @@ jobs:
 
     steps:
       - name: Download all the dists
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: python-package-distributions
           path: dist/