Bump @github/markdown-toolbar-element from 2.0.0 to 2.1.1

Bumps [@github/markdown-toolbar-element](https://github.com/github/markdown-toolbar-element) from 2.0.0 to 2.1.1.
- [Release notes](https://github.com/github/markdown-toolbar-element/releases)
- [Commits](https://github.com/github/markdown-toolbar-element/compare/v2.0.0...v2.1.1)
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