Update sphinx-book-theme requirement from <1.1,>=1.0.0 to >=1.0.0,<1.2

Updates the requirements on [sphinx-book-theme](https://github.com/executablebooks/sphinx-book-theme) to permit the latest version.
- [Release notes](https://github.com/executablebooks/sphinx-book-theme/releases)
- [Changelog](https://github.com/executablebooks/sphinx-book-theme/blob/master/CHANGELOG.md)
- [Commits](executablebooks/sphinx-book-theme@v1.0.0...v1.1.0)

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

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

Author: dependabot[bot]

pyproject.toml

@@ -46,7 +46,7 @@ dependencies = [
 [project.optional-dependencies]
 docs = [
     "sphinx>=5.3.0,<7.2",
-    "sphinx-book-theme>=1.0.0,<1.1",
+    "sphinx-book-theme>=1.0.0,<1.2",
     "sphinxcontrib-bibtex>=2.5.0,<2.7",
     "myst-parser>=0.18.0,<2.1",
     "myst-nb>=0.17.0,<0.18",