chore(deps): bump pigeon

Bumps the pigeon group with 1 update in the /packages/amplify_datastore directory: [pigeon](https://github.com/flutter/packages/tree/main/packages).


Updates `pigeon` from 11.0.1 to 22.6.0
- [Release notes](https://github.com/flutter/packages/releases)
- [Commits](https://github.com/flutter/packages/commits/pigeon-v22.6.0/packages)

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

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

packages/amplify_datastore/pubspec.yaml

@@ -25,7 +25,7 @@ dev_dependencies:
   flutter_test:
     sdk: flutter
   fake_async: ^1.2.0
-  pigeon: ^11.0.0
+  pigeon: ">=11.0.0 <23.0.0"
 
 # The following section is specific to Flutter.
 flutter: