fix: support Gitea 28.0.0 mail templates

themes/heritage/mail/repo/release.tmpl

@@ -86,7 +86,7 @@
           {{if .Release.Attachments}}
             {{range .Release.Attachments}}
               <li>
-                <a href="{{.DownloadURL}}" target="_blank" style="color:#1e3a5f;text-decoration:none;font-weight:600;border-bottom:1px dotted #8b6914;">{{.Name}} ({{.Size | FileSize}})</a>
+                <a href="{{.DownloadURL}}" target="_blank" style="color:#1e3a5f;text-decoration:none;font-weight:600;border-bottom:1px dotted #8b6914;">{{.Name}} ({{.Size | FormatByteSize}})</a>
               </li>
             {{end}}
           {{end}}
@@ -119,4 +119,4 @@
     </div>
   </center>
 </body>
-</html>
+</html>