Upgrade mermaid.js to the latest version

### ⚠️ This issue respects the following points: ⚠️

- [x] This is a **enhancement/feature request**. Not a [bug or question](https://github.com/gsantner/markor/issues/new/choose).
- [x] The topic is **not** already reported at [Issues](https://github.com/gsantner/markor/issues?q=#js-issues-search). _(I've searched it and checked most recent issues)_.
- [x] Markor **is** up to date. See [Releases](https://github.com/gsantner/markor/tags) for the latest version. Updates are available from [F-Droid](https://f-droid.org/en/packages/net.gsantner.markor/) and GitHub.
- [x] The wanted feature/enhancement is not present in the latest development version (git master). (Please [download](https://nightly.link/gsantner/markor/workflows/build-android-project/master) and try the test version of Markor, named **Marder**. Don't worry; Markor and Marder appear as completely separate applications. You can install both side-by-side, and Markor's settings are not touched. If your desired feature is present, you don't need to open this issue. The change will be part of the next Markor update.)

### Description

Upgrade mermaid.js to the latest version, please

### Information

Android version:
Device (phone model):
App Version:

### Source

F-Droid

### Format / File type

Not specific

### Additional info / Log

```shell
-
```

No file, test, or entry point is named. Start by locating Markor's mermaid.js dependency and the code or assets that load it, then check the latest upstream release and its compatibility with the Android app. Done means the dependency is upgraded and Mermaid content still renders correctly.

Written by the indexing model from the issue text.