The link google sent me won't work unless you're logged into my google account. But it basically says:
data-vocabulary.org schema deprecated
First detected: 1/21/20
Status: Warning
Then it goes on to list 1000 URLs on my site that are all affected. I have over 4000 pages on the site so I guess google limited their report to 1000 URLs.
Here are some links that seemed relevant:
https://techiestechguide.com/solved-data-vocabulary-org-schema-deprecated-google-webmaster/
https://www.pgupdates.ng/data-vocabulary-org-schema-deprecated/
https://meetanshi.com/blog/fix-data-vocabulary-org-schema-deprecated-error/
I found this code on line 44 of public_html/templates/gazetta/html/mod_breadcrumbs/default.php
echo '<li itemscope itemtype="http://data-vocabulary.org/Breadcrumb">';
...but I don't know enough about the code in this template to just go in there and change this line to reflect the new "schema.org". I have no idea what this would do to the site, and I don't know if there are many other places in the template code that would also need to be changed.
Here's one of the URLs google reported: https://rapmag.com/news/4305-presonus-now-shipping-new-eris-xt-monitors
Thanks for taking a look!