Composer detected issues in your platform: Your Composer dependencies require a PHP version ">= 7.3.0"

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I was able to get this resolved. Seems I was missing was step of the PHP upgrade as guided here Upgrading php7.2 to php7.4 in Ubuntu 18.04LTS

I haven’t had added this to my librenms.conf file:

  <FilesMatch ".+\.php$">
    SetHandler "proxy:unix:/run/php-fpm-librenms.sock|fcgi://localhost"
  </FilesMatch>

All good now. Thanks.