build(deps): bump hypothesis from 6.138.3 to 6.138.4 in /book/src

Bumps [hypothesis](https://github.com/HypothesisWorks/hypothesis) from 6.138.3 to 6.138.4.
- [Release notes](https://github.com/HypothesisWorks/hypothesis/releases)
- [Commits](HypothesisWorks/hypothesis@hypothesis-python-6.138.3...hypothesis-python-6.138.4)

---
updated-dependencies:
- dependency-name: hypothesis
  dependency-version: 6.138.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

book/src/requirements.txt

@@ -1,7 +1,7 @@
 black==24.10.0
 coverage==7.10.5
 flake8==7.1.2
-hypothesis==6.138.3
+hypothesis==6.138.4
 isort==5.13.2
 MutPy==0.6.1
 mypy==1.17.1