DO NOT USE THIS REPO. Outdated 2.1.1. Magento Marketplace got the last one

[FredericMartinez]

1. Do not use this repo, still on 2.1.1, 2.1.9 on Magento Marketplace
2. Add https://marketplace.magento.com/sendinblue-module-sendinblue.html to your account
3. composer require sendinblue/module-sendinblue

[kestraly]

Markeplace version is out of date for Magento 2.4.4+
You'll also need to install composer require laminas/laminas-crypt to get it going again until they update it