[TASK] Update codecov/codecov-action action to v4

| datasource  | package                | from | to |
| ----------- | ---------------------- | ---- | -- |
| github-tags | codecov/codecov-action | v3   | v4 |

Author: renovate[bot]

.github/workflows/tests.yaml

@@ -112,7 +112,7 @@ jobs:
 
       # codecov
       - name: codecov report
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           files: |