chore(deps): update codecov/codecov-action action to v4

Author: renovate[bot]

.github/workflows/unit-testing.yml

@@ -23,6 +23,6 @@ jobs:
         env:
           CI: true
       - name: Codecov
-        uses: codecov/codecov-action@v3.1.1
+        uses: codecov/codecov-action@v4.1.1
         with:
           token: ${{ secrets.CODECOV_TOKEN }}