build(deps): bump the npm group with 2 updates (#14)

Updates the requirements on [mermaid](https://github.com/mermaid-js/mermaid) and [tocbot](https://github.com/tscanlin/tocbot) to permit the latest version.

Updates `mermaid` to 10.6.0
- [Release notes](https://github.com/mermaid-js/mermaid/releases)
- [Changelog](https://github.com/mermaid-js/mermaid/blob/develop/CHANGELOG.md)
- [Commits](https://github.com/mermaid-js/mermaid/compare/v10.5.0...v10.6.0)

Updates `tocbot` to 4.21.3
- [Release notes](https://github.com/tscanlin/tocbot/releases)
- [Changelog](https://github.com/tscanlin/tocbot/blob/master/CHANGELOG.md)
- [Commits](https://github.com/tscanlin/tocbot/compare/v4.21.2...v4.21.3)

---
updated-dependencies:
- dependency-name: mermaid
  dependency-type: direct:production
  dependency-group: npm
- dependency-name: tocbot
  dependency-type: direct:production
  dependency-group: npm
...

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

tocbot/tocbot.min.css

@@ -1,6 +1,6 @@
 /**
  * Skipped minification because the original files appears to be already minified.
- * Original file: /npm/tocbot@4.21.2/dist/tocbot.css
+ * Original file: /npm/tocbot@4.21.3/dist/tocbot.css
  *
  * Do NOT use SRI with dynamically generated files! More information: https://www.jsdelivr.com/using-sri-with-dynamic-files
  */