build(deps): bump mermaid from 8.11.0 to 8.13.8 (#47)

Bumps [mermaid](https://github.com/knsv/mermaid) from 8.11.0 to 8.13.8.
- [Release notes](https://github.com/knsv/mermaid/releases)
- [Changelog](https://github.com/mermaid-js/mermaid/blob/develop/docs/CHANGELOG.md)
- [Commits](mermaid-js/mermaid@8.11.0...8.13.8)

---
updated-dependencies:
- dependency-name: mermaid
  dependency-type: direct:production
...

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package.json

@@ -53,7 +53,7 @@
     "is-regexp": "^3.0.0",
     "lodash": "^4.17.21",
     "lower-case": "^1.1.4",
-    "mermaid": "^8.11.0",
+    "mermaid": "^8.13.8",
     "minify": "^4.1.3",
     "moment-mini": "^2.24.0",
     "ms": "^2.1.3",