Bump sphinx-rtd-theme from 1.3.0 to 2.0.0

Bumps [sphinx-rtd-theme](https://github.com/readthedocs/sphinx_rtd_theme) from 1.3.0 to 2.0.0.
- [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
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -7,7 +7,7 @@ h5netcdf==1.3.0
 geopandas==0.14.3
 matplotlib==3.8.3
 Sphinx==7.2.5
-sphinx-rtd-theme==1.3.0
+sphinx-rtd-theme==2.0.0
 pytest==8.0.2
 pytest-cov==4.1.0
 pyyaml==6.0.1