open_basedir() warnings

These are harmless, but they clutter the logs:

Jun 28 19:20:36 http2 php: PHP Warning:  file_exists(): open_basedir restriction in effect. File(/wp-content/uploads/2022/04/example.pdf) is not within the allowed path(s): (/var/www/example.com/www/:/usr/share/php/:/usr/local/lib/wordpress/plugins/) in /usr/local/lib/wordpress/plugins/download-monitor/src/FileManager.php on line 68

I think the issue is that calling file_exists() on a relative path will generally run afoul of open_basedir().