Bump pigeon in /add_to_app/books/flutter_module_books (#1393)

Bumps [pigeon](https://github.com/flutter/packages/tree/main/packages) from 3.2.9 to 4.0.2.
- [Release notes](https://github.com/flutter/packages/releases)
- [Commits](https://github.com/flutter/packages/commits/pigeon-v4.0.2/packages)

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

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

add_to_app/books/flutter_module_books/pubspec.yaml

@@ -13,7 +13,7 @@ dependencies:
     sdk: flutter
 
 dev_dependencies:
-  pigeon: ">=2.0.2 <4.0.0"
+  pigeon: ">=2.0.2 <5.0.0"
   flutter_test:
     sdk: flutter
   flutter_lints: ^2.0.1