build(deps): bump mypy-extensions from 1.0.0 to 1.1.0 in /book/src

Bumps [mypy-extensions](https://github.com/python/mypy_extensions) from 1.0.0 to 1.1.0.
- [Commits](python/mypy_extensions@1.0.0...1.1.0)

---
updated-dependencies:
- dependency-name: mypy-extensions
  dependency-version: 1.1.0
  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

@@ -5,7 +5,7 @@ hypothesis==6.131.7
 isort==5.13.2
 MutPy==0.6.1
 mypy==1.15.0
-mypy-extensions==1.0.0
+mypy-extensions==1.1.0
 pinject==0.14.1
 pip-tools==7.4.1
 pyflakes==3.2.0