Bump sphinxcontrib-mermaid from 2.0.3 to 2.1.0 (#2470)

Bumps [sphinxcontrib-mermaid](https://github.com/mgaitan/sphinxcontrib-mermaid) from 2.0.3 to 2.1.0.
- [Changelog](https://github.com/mgaitan/sphinxcontrib-mermaid/blob/master/CHANGELOG.md)
- [Commits](mgaitan/sphinxcontrib-mermaid@2.0.3...2.1.0)

---
updated-dependencies:
- dependency-name: sphinxcontrib-mermaid
  dependency-version: 2.1.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]