fix: support Gitea 28.0.0 mail templates

themes/ember/mail/repo/release.tmpl

@@ -93,7 +93,7 @@
           {{if .Release.Attachments}}
             {{range .Release.Attachments}}
               <li>
-                <a href="{{.DownloadURL}}" target="_blank" style="color:#ea580c;text-decoration:none;font-weight:600;">{{.Name}} ({{.Size | FileSize}})</a>
+                <a href="{{.DownloadURL}}" target="_blank" style="color:#ea580c;text-decoration:none;font-weight:600;">{{.Name}} ({{.Size | FormatByteSize}})</a>
               </li>
             {{end}}
           {{end}}
@@ -126,4 +126,4 @@
     </div>
   </center>
 </body>
-</html>
+</html>