Update dependency lunr to v0.8.0 (#1993)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [lunr](https://redirect.github.com/yeraydiazdiaz/lunr.py)
([changelog](https://redirect.github.com/yeraydiazdiaz/lunr.py/blob/master/CHANGELOG.md))
| minor | `==0.7.0.post1` -> `==0.8.0` |

---

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### Release Notes

<details>
<summary>yeraydiazdiaz/lunr.py (lunr)</summary>

###
[`v0.8.0`](https://redirect.github.com/yeraydiazdiaz/lunr.py/blob/HEAD/CHANGELOG.md#080-2025-03-08)

[Compare
Source](https://redirect.github.com/yeraydiazdiaz/lunr.py/compare/0.7.0.post1...0.8.0)

-   Drop support for Python 3.7 and 3.8
-   Add support for Python 3.12 and 3.13

</details>

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.github/workflows/mkdocs-requirements.txt

@@ -2,7 +2,7 @@ click==8.1.8
 future==1.0.0
 Jinja2==3.1.6
 livereload==2.7.1
-lunr==0.7.0.post1
+lunr==0.8.0
 Markdown==3.7
 MarkupSafe==3.0.2
 mkdocs==1.6.1