where to find this script on wordpress website theme?

My website is loading this request which I am not using and I don’t want, the problem is causing by theme but I don’t know where the hell this code is, I almost looked on header.php file, functions, single post and many otheres but don’t able to find it.

My website: https://shoutusreview.com/

https://connect.facebook.net/en_GB/sdk.js

https://connect.facebook.net/en_GB/sdk.js?hash=8dc50b3dbc74f93fb18a97b24cc2b49c&ua=modern_es6