build(deps-dev): update sphinx-rtd-theme requirement from ~=1.3 to ~=2.0

Updates the requirements on [sphinx-rtd-theme](https://github.com/readthedocs/sphinx_rtd_theme) to permit the latest version.
- [Changelog](https://github.com/readthedocs/sphinx_rtd_theme/blob/master/docs/changelog.rst)
- [Commits](readthedocs/sphinx_rtd_theme@1.3.0...2.0.0)

---
updated-dependencies:
- dependency-name: sphinx-rtd-theme
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

pyproject.toml

@@ -70,7 +70,7 @@ dev = [
 docs = [
   "myst-parser~=2.0",
   "sphinx~=7.2",
-  "sphinx-rtd-theme~=1.3"
+  "sphinx-rtd-theme~=2.0"
 ]
 lint = [
   "pre-commit~=3.4"