Update codecov/codecov-action action to v4

Author: renovate[bot]

.github/workflows/test.yml

@@ -63,7 +63,7 @@ jobs:
           pytest --cov=spatialtis/ --cov-report=xml tests/
 
       - name: Codecov
-        uses: codecov/codecov-action@v3.0.0
+        uses: codecov/codecov-action@v4.0.0
         with:
           # User defined upload name. Visible in Codecov UI
           name: spatialtis-cov