Build(deps): Bump sphinx-rtd-theme in /cmake/tribits/doc/sphinx (#544)

Bumps [sphinx-rtd-theme](https://github.com/readthedocs/sphinx_rtd_theme) from 3.0.1 to 3.0.2.
- [Changelog](https://github.com/readthedocs/sphinx_rtd_theme/blob/master/docs/changelog.rst)
- [Commits](readthedocs/sphinx_rtd_theme@3.0.1...3.0.2)

---
updated-dependencies:
- dependency-name: sphinx-rtd-theme
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

cmake/tribits/doc/sphinx/requirements.txt

@@ -1,2 +1,2 @@
 Sphinx==8.1.3
-sphinx-rtd-theme==3.0.1
+sphinx-rtd-theme==3.0.2