⬆️ Update sphinx-immaterial requirement

Updates the requirements on [sphinx-immaterial](https://github.com/jbms/sphinx-immaterial) to permit the latest version.
- [Release notes](https://github.com/jbms/sphinx-immaterial/releases)
- [Commits](jbms/sphinx-immaterial@v0.11.11...v0.13.0)

---
updated-dependencies:
- dependency-name: sphinx-immaterial
  dependency-type: direct:production
...

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

pyproject.toml

@@ -58,7 +58,7 @@ docs = [
   "sphinxcontrib-programoutput~=0.17",
   "sphinx-design~=0.6",
 ]
-theme-im = ["sphinx-immaterial~=0.11.11"]
+theme-im = ["sphinx-immaterial~=0.13.0"]
 theme-furo = ["furo~=2024.8.6"]
 theme-pds = ["pydata-sphinx-theme~=0.15.2"]
 theme-rtd = ["sphinx_rtd_theme>=3.0.2,<4"]