Bump @matrix-widget-toolkit/mui from 1.0.7 to 1.1.5

Bumps [@matrix-widget-toolkit/mui](https://github.com/nordeck/matrix-widget-toolkit/tree/HEAD/packages/mui) from 1.0.7 to 1.1.5.
- [Release notes](https://github.com/nordeck/matrix-widget-toolkit/releases)
- [Changelog](https://github.com/nordeck/matrix-widget-toolkit/blob/main/packages/mui/CHANGELOG.md)
- [Commits](https://github.com/nordeck/matrix-widget-toolkit/commits/@matrix-widget-toolkit/mui@1.1.5/packages/mui)

---
updated-dependencies:
- dependency-name: "@matrix-widget-toolkit/mui"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -11,7 +11,7 @@
     "@carbon/import-once": "^10.7.0",
     "@carbon/styles": "^1.25.0",
     "@matrix-widget-toolkit/api": "^3.1.0",
-    "@matrix-widget-toolkit/mui": "^1.0.7",
+    "@matrix-widget-toolkit/mui": "^1.1.5",
     "@matrix-widget-toolkit/react": "^1.0.4",
     "@mui/icons-material": "^5.11.0",
     "@mui/lab": "^5.0.0-alpha.117",