chore(deps): update dependency pymdown-extensions to v10.8

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pymdown-extensions	==10.7.1 -> ==10.8

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Release Notes

facelessuser/pymdown-extensions (pymdown-extensions)

### [`v10.8`](https://togithub.com/facelessuser/pymdown-extensions/releases/tag/10.8) [Compare Source](https://togithub.com/facelessuser/pymdown-extensions/compare/10.7.1...10.8) #### 10.8 - **NEW**: Require Python Markdown 3.6+. - **FIX**: Fix some test cases. - **FIX**: Fix warnings due to recent changes in Python Markdown.

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