There's a closed pull request on the void-packages repository

mdbook-toc: Fix mdbook warning
https://github.com/void-linux/void-packages/pull/48882

Description:
mdbook complains that mdbook-toc was built against mdbook version 0.4.36 which is outdated now:

```
Warning: The mdbook-toc preprocessor was built against version 0.4.36 of mdbook, but we're being called from version 0.4.37
```

There are probably more elegant and future proof ways to solve this (one of which is just ignoring the warning because it's a warning and not an error), but bumping mdbook-toc fixes it too.

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