build(deps): bump jupyter-book from 0.15.1 to 1.0.3 in /requirements

Bumps [jupyter-book](https://github.com/executablebooks/jupyter-book) from 0.15.1 to 1.0.3.
- [Release notes](https://github.com/executablebooks/jupyter-book/releases)
- [Changelog](https://github.com/jupyter-book/jupyter-book/blob/main/CHANGELOG.md)
- [Commits](jupyter-book/jupyter-book@v0.15.1...v1.0.3)

---
updated-dependencies:
- dependency-name: jupyter-book
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

requirements/docs.txt

@@ -1,5 +1,5 @@
 demesdraw
-jupyter-book==0.15.1
+jupyter-book==1.0.3
 piccolo_theme
 sphinx_issues
 sphinxcontrib-programoutput