chore: bump codecov/codecov-action from 5 to 6 (#360)

Author: dependabot[bot]

.github/workflows/unit-integration-tests.yml

@@ -53,7 +53,7 @@ jobs:
         run: make test
 
       - name: Upload Codecov report
-        uses: codecov/codecov-action@v5
+        uses: codecov/codecov-action@v6
         with:
           ## Repository upload token - get it from codecov.io. Required only for private repositories
           token: ${{ secrets.CODECOV_TOKEN }}