A minimal change to replace data calls with attr as per guidelines (#19900)

This affects the manage topics on a repository.
Namely the done button once changes are made.

Signed-off-by: André Jaenisch <andre.jaenisch@posteo.de>

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

web_src/js/features/repo-home.js

@@ -30,7 +30,7 @@ export function initRepoTopicBar() {
   saveBtn.on('click', () => {
     const topics = $('input[name=topics]').val();
 
-    $.post(saveBtn.data('link'), {
+    $.post(saveBtn.attr('data-link'), {
       _csrf: csrfToken,
       topics
     }, (_data, _textStatus, xhr) => {