build(deps): bump isort from 5.13.2 to 6.1.0 in /book/src

Bumps [isort](https://github.com/PyCQA/isort) from 5.13.2 to 6.1.0.
- [Release notes](https://github.com/PyCQA/isort/releases)
- [Changelog](https://github.com/PyCQA/isort/blob/main/CHANGELOG.md)
- [Commits](PyCQA/isort@5.13.2...6.1.0)

---
updated-dependencies:
- dependency-name: isort
  dependency-version: 6.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

book/src/requirements.txt

@@ -2,7 +2,7 @@ black==24.10.0
 coverage==7.10.6
 flake8==7.1.2
 hypothesis==6.140.2
-isort==5.13.2
+isort==6.1.0
 MutPy==0.6.1
 mypy==1.18.2
 mypy-extensions==1.1.0