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/plugins/poll/components/poll-form-view.js

@@ -113,7 +113,7 @@ export default class MUCPollFormView extends CustomElement {
       await api.sendIQ(iq)
 
       if (this.modal) {
-        this.modal.onHide()
+        this.modal.close()
       }
     } catch (err) {
       if (u.isErrorStanza(err)) {