Bump mermaid from 9.1.1 to 9.4.0

Bumps [mermaid](https://github.com/mermaid-js/mermaid) from 9.1.1 to 9.4.0.
- [Release notes](https://github.com/mermaid-js/mermaid/releases)
- [Changelog](https://github.com/mermaid-js/mermaid/blob/develop/CHANGELOG.md)
- [Commits](mermaid-js/mermaid@9.1.1...v9.4.0)

---
updated-dependencies:
- dependency-name: org.webjars.npm:mermaid
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

build-parent/pom.xml

@@ -136,7 +136,7 @@
  <webjar.jquery.version>3.6.3</webjar.jquery.version>
  <webjar.codemirror.version>5.62.2</webjar.codemirror.version>
  <!-- we don't add mermaid as a dependency as it brings a ton of things we don't use -->
- <webjar.mermaid.version>9.1.1</webjar.mermaid.version>
+ <webjar.mermaid.version>9.4.0</webjar.mermaid.version>
  <webjar.d3js.version>6.6.0</webjar.d3js.version>
  <webjar.chartjs.version>3.7.1</webjar.chartjs.version>