fix: support Gitea 28.0.0 mail templates

themes/mono/mail/repo/release.tmpl

@@ -99,7 +99,7 @@
                   {{end}}
                   {{if .Release.Attachments}}
                     {{range .Release.Attachments}}
-                      <li><a href="{{.DownloadURL}}">{{.Name}} ({{.Size | FileSize}})</a></li>
+                      <li><a href="{{.DownloadURL}}">{{.Name}} ({{.Size | FormatByteSize}})</a></li>
                     {{end}}
                   {{end}}
                 </ul>
@@ -149,4 +149,4 @@
     </table>
   </center>
 </body>
-</html>
+</html>