chore(deps): update dependency markdown to v3.8 (#2033)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [Markdown](https://redirect.github.com/Python-Markdown/markdown)
([changelog](https://python-markdown.github.io/changelog/)) | minor |
`==3.7` -> `==3.8` |

---

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---

### Release Notes

<details>
<summary>Python-Markdown/markdown (Markdown)</summary>

###
[`v3.8`](https://redirect.github.com/Python-Markdown/markdown/releases/tag/3.8)

[Compare
Source](https://redirect.github.com/Python-Markdown/markdown/compare/3.7...3.8)

##### Changed

- DRY fix in `abbr` extension by introducing method `create_element`
([#&#8203;1483](https://redirect.github.com/Python-Markdown/markdown/issues/1483)).
-   Clean up test directory by removing some redundant tests and port
    non-redundant cases to the newer test framework.
- Improved performance of the raw HTML post-processor
([#&#8203;1510](https://redirect.github.com/Python-Markdown/markdown/issues/1510)).

##### Fixed

- Backslash Unescape IDs set via `attr_list` on `toc`
([#&#8203;1493](https://redirect.github.com/Python-Markdown/markdown/issues/1493)).
- Ensure `md_in_html` processes content inside "markdown" blocks as they
are
parsed outside of "markdown" blocks to keep things more consistent for
third-party extensions
([#&#8203;1503](https://redirect.github.com/Python-Markdown/markdown/issues/1503)).
- `md_in_html` handle tags within inline code blocks better
([#&#8203;1075](https://redirect.github.com/Python-Markdown/markdown/issues/1075)).
- `md_in_html` fix handling of one-liner block HTML handling
([#&#8203;1074](https://redirect.github.com/Python-Markdown/markdown/issues/1074)).
- Ensure `<center>` is treated like a block-level element
([#&#8203;1481](https://redirect.github.com/Python-Markdown/markdown/issues/1481)).
- Ensure that `abbr` extension respects `AtomicString` and does not
process
perceived abbreviations in these strings
([#&#8203;1512](https://redirect.github.com/Python-Markdown/markdown/issues/1512)).
- Ensure `smarty` extension correctly renders nested closing quotes
([#&#8203;1514](https://redirect.github.com/Python-Markdown/markdown/issues/1514)).

</details>

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Author: slack-oss-bot

.github/workflows/mkdocs-requirements.txt

@@ -3,7 +3,7 @@ future==1.0.0
 Jinja2==3.1.6
 livereload==2.7.1
 lunr==0.8.0
-Markdown==3.7
+Markdown==3.8
 MarkupSafe==3.0.2
 mkdocs==1.6.1
 mkdocs-macros-plugin==1.3.7