Ensure Codecov doesn't break CI if token is missing

Author: 7w1

.github/workflows/test.yaml

@@ -30,6 +30,7 @@ jobs:
       # zizmor: ignore[unfenced-secrets]
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@13ce06bfc6bbe3ecf90edbbf1bc32fe5978ca1d3 # v5.3.1
+        if: ${{ secrets.CODECOV_TOKEN != '' }}
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           fail_ci_if_error: true