chore(deps): bump lodash-es and mermaid in /docs (#887)

Bumps [lodash-es](https://github.com/lodash/lodash) and [mermaid](https://github.com/mermaid-js/mermaid). These dependencies needed to be updated together.

Updates `lodash-es` from 4.17.21 to 4.18.1
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.21...4.18.1)

Updates `mermaid` from 11.12.0 to 11.15.0
- [Release notes](https://github.com/mermaid-js/mermaid/releases)
- [Commits](https://github.com/mermaid-js/mermaid/compare/mermaid@11.12.0...mermaid@11.15.0)

---
updated-dependencies:
- dependency-name: lodash-es
  dependency-version: 4.18.1
  dependency-type: indirect
- dependency-name: mermaid
  dependency-version: 11.15.0
  dependency-type: indirect
...

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Author: dependabot[bot]