Update dependency livereload to v2.7.0 (#1489)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [livereload](https://togithub.com/lepture/python-livereload) | minor |
`==2.6.3` -> `==2.7.0` |

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### Release Notes

<details>
<summary>lepture/python-livereload (livereload)</summary>

###
[`v2.7.0`](https://togithub.com/lepture/python-livereload/blob/HEAD/CHANGES.rst#Version-270)

[Compare
Source](https://togithub.com/lepture/python-livereload/compare/2.6.3...2.7.0)

Released on Jun 23, 2024

1.  Fixed many bugs

</details>

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.github/workflows/mkdocs-requirements.txt

@@ -1,7 +1,7 @@
 click==8.1.7
 future==1.0.0
 Jinja2==3.1.4
-livereload==2.6.3
+livereload==2.7.0
 lunr==0.7.0.post1
 Markdown==3.6
 MarkupSafe==2.1.5