Bump github from 9.8.0 to 9.9.0 in /app_dart (#2451)

Bumps [github](https://github.com/SpinlockLabs/github.dart) from 9.8.0 to 9.9.0.
- [Release notes](https://github.com/SpinlockLabs/github.dart/releases)
- [Changelog](https://github.com/SpinlockLabs/github.dart/blob/master/CHANGELOG.md)
- [Commits](https://github.com/SpinlockLabs/github.dart/commits)

---
updated-dependencies:
- dependency-name: github
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
diff --git a/app_dart/pubspec.lock b/app_dart/pubspec.lock
index b733f3a..ff57e9f 100644
--- a/app_dart/pubspec.lock
+++ b/app_dart/pubspec.lock
@@ -238,7 +238,7 @@
       name: github
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "9.8.0"
+    version: "9.9.0"
   glob:
     dependency: transitive
     description:
diff --git a/app_dart/pubspec.yaml b/app_dart/pubspec.yaml
index 4260dfb..82681be 100644
--- a/app_dart/pubspec.yaml
+++ b/app_dart/pubspec.yaml
@@ -20,7 +20,7 @@
   file: ^6.1.4
   fixnum: ^1.0.1
   gcloud: ^0.8.4
-  github: ^9.8.0
+  github: ^9.9.0
   googleapis: ^9.2.0
   googleapis_auth: ^1.3.1
   gql: ^0.14.0