The issue is that the package illuminate/support wasn't updated to v5.3.23.
Running again composer update solved the issue, actually I first downgraded lumen to 5.2.*, removed the vendor folder and the composer.lock, then composer install, then I changed to 5.3.* and did the the same process, this time the illuminate/support package was updated to v5.3.23.
This is the related question on stackoverflow
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