jQuery Migrate Helper warnings

After updating to WP 5.1, our hosting company installed JQuery Migrate Helper and it’s showing this warning on the post edit screen:

https://careerprocanada.ca/wp-content/plugins/publishpress/modules/custom-status/lib/custom-status.js: jQuery.fn.attr(‘selected’) might use property instead of attribute

The Posts page in the dashboard shows these warnings:

https://careerprocanada.ca/wp-content/plugins/publishpress/modules/custom-status/lib/custom-status.js: $(html) HTML text after last tag is ignored
https://careerprocanada.ca/wp-content/plugins/publishpress/modules/custom-status/lib/custom-status.js: jQuery.fn.attr(‘selected’) might use property instead of attribute

Both warnings are followed by:

Please make sure you are using the latest version of all of your plugins, and your theme. If you are, you may want to ask the developers of the code mentioned in the warnings for an update.

All plugins and theme are up-to-date.

The page I need help with: [log in to see the link]