build(deps): bump hypothesis from 6.119.4 to 6.121.0 in /book/src

Bumps [hypothesis](https://github.com/HypothesisWorks/hypothesis) from 6.119.4 to 6.121.0.
- [Release notes](https://github.com/HypothesisWorks/hypothesis/releases)
- [Commits](HypothesisWorks/hypothesis@hypothesis-python-6.119.4...hypothesis-python-6.121.0)

---
updated-dependencies:
- dependency-name: hypothesis
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

book/src/requirements.txt

@@ -1,7 +1,7 @@
 black==24.10.0
 coverage==7.6.8
 flake8==7.1.1
-hypothesis==6.119.4
+hypothesis==6.121.0
 isort==5.13.2
 MutPy==0.6.1
 mypy==1.13.0