The GitHub Pages workflow we have been using "upload-pages-artifact@v2" used a deprecated version of "upload-pages-artifact". I updated this workflow to "upload-pages-artifact@v3", which uses the new "upload-pages-artifact@v4". It appears the "path" argument may now be required, despite the default "path" of "_site/" remaining unchanged from the previous version.
The GitHub Pages workflow we have been using "upload-pages-artifact@v2" used a deprecated version of "upload-pages-artifact". I updated this workflow to "upload-pages-artifact@v3", which uses the new "upload-pages-artifact@v4". It appears the "path" argument may now be required, despite the default "path" of "_site/" remaining unchanged from the previous version.