Update dependency sphinx_rtd_theme to v3 (#125)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[sphinx_rtd_theme](https://redirect.github.com/readthedocs/sphinx_rtd_theme)
| `==2.0.0` -> `==3.0.2` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/sphinx-rtd-theme/3.0.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/sphinx-rtd-theme/3.0.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/sphinx-rtd-theme/2.0.0/3.0.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/sphinx-rtd-theme/2.0.0/3.0.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

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### Release Notes

<details>
<summary>readthedocs/sphinx_rtd_theme (sphinx_rtd_theme)</summary>

###
[`v3.0.2`](https://redirect.github.com/readthedocs/sphinx_rtd_theme/compare/3.0.1...3.0.2)

[Compare
Source](https://redirect.github.com/readthedocs/sphinx_rtd_theme/compare/3.0.1...3.0.2)

###
[`v3.0.1`](https://redirect.github.com/readthedocs/sphinx_rtd_theme/compare/3.0.0...3.0.1)

[Compare
Source](https://redirect.github.com/readthedocs/sphinx_rtd_theme/compare/3.0.0...3.0.1)

###
[`v3.0.0`](https://redirect.github.com/readthedocs/sphinx_rtd_theme/compare/2.0.0...3.0.0)

[Compare
Source](https://redirect.github.com/readthedocs/sphinx_rtd_theme/compare/2.0.0...3.0.0)

</details>

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docs/requirements.txt

@@ -1,4 +1,4 @@
-sphinx_rtd_theme==2.0.0
+sphinx_rtd_theme==3.0.2
 sphinx==8.2.3
 sphinx-autobuild==2024.10.3
 myst-parser==4.0.1