[Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v3.21.0-rc.1...v3.21.0) 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](https://github.com/MR-ZHEEV) for responsibly disclosing this via Matrix's Security Disclosure Policy. * Upgrade to JS SDK 11.0.0 * [Release] Add missing space on beta feedback dialog [\#6019](https://github.com/matrix-org/matrix-react-sdk/pull/6019) * [Release] Add feedback mechanism for beta features, namely Spaces [\#6013](https://github.com/matrix-org/matrix-react-sdk/pull/6013) * Add feedback mechanism for beta features, namely Spaces [\#6012](https://github.com/matrix-org/matrix-react-sdk/pull/6012)