chore(deps): update dependency sphinxcontrib-plantuml to v0.28

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sphinxcontrib-plantuml	==0.27 -> ==0.28

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Release Notes

sphinx-contrib/plantuml (sphinxcontrib-plantuml)

### [`v0.28`](https://togithub.com/sphinx-contrib/plantuml/compare/0.27...0.28) [Compare Source](https://togithub.com/sphinx-contrib/plantuml/compare/0.27...0.28)

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Configuration

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (7a879f4) 95.73% compared to head (f79761c) 95.73%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #494 +/- ## ======================================= Coverage 95.73% 95.73% ======================================= Files 20 20 Lines 1338 1338 Branches 199 199 ======================================= Hits 1281 1281 Misses 46 46 Partials 11 11 ```

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[github-actions[bot]]

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