Bump pigeon from 13.1.2 to 14.0.0 in /add_to_app/books/flutter_module_books (#2097)

Bumps [pigeon](https://github.com/flutter/packages/tree/main/packages) from 13.1.2 to 14.0.0.
<details>
<summary>Commits</summary>
<ul>
<li><a href="db86e8f086"><code>db86e8f</code></a> [pigeon] isEnum, isClass, fix swift casting, default values, optional method ...</li>
<li><a href="a8bb8330c3"><code>a8bb833</code></a> [plugin_platform_interface] Switch mixin to <code>mixin class</code> (<a href="https://github.com/flutter/packages/tree/main/packages/issues/5420">#5420</a>)</li>
<li><a href="14ed53b549"><code>14ed53b</code></a> [go_router] Fixes use of <code>Iterable</code> (<a href="https://github.com/flutter/packages/tree/main/packages/issues/5421">#5421</a>)</li>
<li>See full diff in <a href="https://github.com/flutter/packages/commits/pigeon-v14.0.0/packages">compare view</a></li>
</ul>
</details>
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add_to_app/books/flutter_module_books/pubspec.yaml

@@ -15,7 +15,7 @@ dependencies:
 dev_dependencies:
   analysis_defaults:
     path: ../../../analysis_defaults
-  pigeon: ">=11.0.0 <14.0.0"
+  pigeon: ">=11.0.0 <15.0.0"
   flutter_test:
     sdk: flutter