Make artifact names unique for v4 of action

Author: dalito

.github/workflows/ci.yml

@@ -49,7 +49,7 @@ jobs:
     - name: Upload coverage data
       uses: actions/upload-artifact@v4
       with:
-        name: coverage-data
+        name: coverage-data-${{ matrix.python-version }}
         path: .coverage.*
 
   coverage:
@@ -67,9 +67,10 @@ jobs:
         run: python -m pip install --upgrade coverage[toml]
 
       - name: Download data
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
-          name: coverage-data
+          pattern: coverage-data-*
+          merge-multiple: true
 
       - name: Combine coverage, create reports and fail if less than threshold.
         run: |