Bump matrix-js-sdk from 31.3.0 to 31.6.0

Bumps [matrix-js-sdk](https://github.com/matrix-org/matrix-js-sdk) from 31.3.0 to 31.6.0.
- [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](matrix-org/matrix-js-sdk@v31.3.0...v31.6.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -21,7 +21,7 @@
     "@actions/github": "^6.0.0",
     "@vercel/ncc": "^0.38.1",
     "markdown-it": "^14.0.0",
-    "matrix-js-sdk": "^31.3.0"
+    "matrix-js-sdk": "^31.6.0"
   },
   "devDependencies": {
     "eslint": "^8.56.0",