Bump matrix-js-sdk from 21.1.0 to 21.2.0 (#993)

Bumps [matrix-js-sdk](https://github.com/matrix-org/matrix-js-sdk) from 21.1.0 to 21.2.0.
- [Release notes](https://github.com/matrix-org/matrix-js-sdk/releases)
- [Changelog](https://github.com/matrix-org/matrix-js-sdk/blob/develop/CHANGELOG.md)
- [Commits](https://github.com/matrix-org/matrix-js-sdk/compare/v21.1.0...v21.2.0)

---
updated-dependencies:
- dependency-name: matrix-js-sdk
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -31,7 +31,7 @@
     "katex": "0.16.3",
     "linkify-html": "4.0.2",
     "linkifyjs": "4.0.2",
-    "matrix-js-sdk": "21.1.0",
+    "matrix-js-sdk": "21.2.0",
     "prop-types": "15.8.1",
     "react": "17.0.2",
     "react-autosize-textarea": "7.1.0",