Updating Converse upstream (with bootstrap5):

* bootstrap 5 compatibility
* other Converse updates integration
* hack to get the sidebar work as with Converse v10.
* modal onHide was renamed close.
* fix slow mode infobox margin.
* fix margin
* shorter action label, for better dropdown UX.

conversejs/custom/shared/modals/livechat-external-login.js

@@ -20,8 +20,8 @@ class ExternalLoginModal extends BaseModal {
     return __(LOC_login_using_external_account)
   }
 
-  onHide () {
-    super.onHide()
+  close () {
+    super.close()
     // kill the externalAuthGetResult handler if still there
     try {
       if (window.externalAuthGetResult) { window.externalAuthGetResult() }