v3.21.0

Full Changelog

Security notice

matrix-react-sdk 3.21.0 fixes a low severity issue (GHSA-8796-gc9j-63rv)
related to file upload. When uploading a file, the local file preview can lead
to execution of scripts embedded in the uploaded file, but only after several
user interactions to open the preview in a separate tab. This only impacts the
local user while in the process of uploading. It cannot be exploited remotely
or by other users. Thanks to Muhammad Zaid Ghifari
for responsibly disclosing this via Matrix's Security Disclosure Policy.

All changes

• Upgrade to JS SDK 11.0.0
• [Release] Add missing space on beta feedback dialog
  #6019
• [Release] Add feedback mechanism for beta features, namely Spaces
  #6013
• Add feedback mechanism for beta features, namely Spaces
  #6012