I get the following error message when trying to build the site:

The "kroki" code block render hook was unable to get the remote diagram. template: _markup/render-codeblock-kroki.html:89:23: executing "_markup/render-codeblock-kroki.html" at <resources.GetRemote>: error calling GetRemote: failed to fetch remote resource from 'https://kroki.io/': Bad Request

A couple days ago everything worked just fine. Any ideas how to fix this?