Update codecov/codecov-action action to v4

Author: renovate[bot]

.github/workflows/verify.yml

@@ -346,7 +346,7 @@ jobs:
           echo "***"
           coverage xml
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
 
   test-publishing:
     name: Build and publish Python 🐍 distributions 📦 to TestPyPI