fix(deps): update dependency mkdocs-build-plantuml-plugin to v2

This MR contains the following updates:

Package	Change	Age	Confidence
mkdocs-build-plantuml-plugin	~=1.4 → ~=2.0

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Release Notes

christo-ph/mkdocs_build_plantuml (mkdocs-build-plantuml-plugin)

v2.0.0

Compare Source

Breaking Changes

This release updates the example project to MkDocs Material 9.x, which requires changes to dark mode configuration.

If you copied the example setup, you need to update:

1. mkdocs.yml theme configuration - Material 9.x uses a different palette syntax:

   theme:
     name: material
     palette:
       - scheme: default
         toggle:
           icon: material/brightness-7
           name: Switch to dark mode
       - scheme: slate
         toggle:
           icon: material/brightness-4
           name: Switch to light mode

2. CSS dark mode selector - Change from @media(prefers-color-scheme: dark) to [data-md-color-scheme="slate"]

3. JavaScript theme detection - Update from matchMedia('prefers-color-scheme') to MutationObserver watching data-md-color-scheme attribute

4. PlantUML theme files - Add skinparam backgroundColor transparent for proper dark mode display

Added

• Test suite with pytest (unit and integration tests)
• GitHub Actions workflow for automated testing
• Transparent background support in PlantUML themes

Changed

• Updated example dependencies to current versions (Material 9.x, pymdown-extensions 10.12, etc.)
• Updated documentation for Material 9.x dark mode setup

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