Looks like Yoast have done it again.
Modified plugin file: wp-content/plugins/wordpress-seo/readme.txt
7.1 appears to have been pushed out with the readme.txt file from – not yet released – 7.2.
= 7.2.0 =
Release Date: April 3rd, 2018
Not a big deal. Except now getting alerts from every single site again and will continue getting them until I use WordFence’s repair function on the file on every site.