Bump pigeon from 18.0.1 to 19.0.0 in /add_to_app/books/flutter_module_books (#2294)

Bumps [pigeon](https://github.com/flutter/packages/tree/main/packages)
from 18.0.1 to 19.0.0.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="6b94aacc9a"><code>6b94aac</code></a>
[pigeon][swift] Removes FlutterError in favor of PigeonError (<a
href="https://github.com/flutter/packages/tree/main/packages/issues/6611">#6611</a>)</li>
<li><a
href="5d951b0638"><code>5d951b0</code></a>
[webview_flutter] Skip &quot;Video playback policy&quot; drive tests (<a
href="https://github.com/flutter/packages/tree/main/packages/issues/6747">#6747</a>)</li>
<li><a
href="788b666693"><code>788b666</code></a>
Update the repo for the 3.22 stable release (<a
href="https://github.com/flutter/packages/tree/main/packages/issues/6730">#6730</a>)</li>
<li><a
href="0870dc84d3"><code>0870dc8</code></a>
[webview_flutter_wkwebview] Fixes JSON.stringify() cannot serialize
cyclic st...</li>
<li><a
href="2f35b836a2"><code>2f35b83</code></a>
[in_app_purchase_storekit] migrate main plugin class to swift in
preperation ...</li>
<li><a
href="0e75adf3a1"><code>0e75adf</code></a>
[image_picker_android] Refactor getting of paths from intent to single
helper...</li>
<li><a
href="abc3d071e4"><code>abc3d07</code></a>
[webview_flutter_wkwebview] Skip <code>withWeakReferenceTo</code>
integration test (<a
href="https://github.com/flutter/packages/tree/main/packages/issues/6731">#6731</a>)</li>
<li><a
href="fd714bd7d5"><code>fd714bd</code></a>
[go_router] Use the correct configuration to build the state passed to
the `o...</li>
<li><a
href="1412041fa3"><code>1412041</code></a>
[in_app_purchase] Update country code Android example (<a
href="https://github.com/flutter/packages/tree/main/packages/issues/6722">#6722</a>)</li>
<li><a
href="9588cce77d"><code>9588cce</code></a>
[camera] Change default Android implementation from
<code>camera_android</code> to `came...</li>
<li>Additional commits viewable in <a
href="https://github.com/flutter/packages/commits/pigeon-v19.0.0/packages">compare
view</a></li>
</ul>
</details>
<br />


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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 <19.0.0"
+  pigeon: ">=11.0.0 <20.0.0"
   flutter_test:
     sdk: flutter