Bump build_runner from 2.2.0 to 2.2.1 in /app_dart (#2134)

diff --git a/app_dart/pubspec.lock b/app_dart/pubspec.lock
index fe87b81..b04fa3c 100644
--- a/app_dart/pubspec.lock
+++ b/app_dart/pubspec.lock
@@ -98,7 +98,7 @@
       name: build_runner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.2.0"
+    version: "2.2.1"
   build_runner_core:
     dependency: transitive
     description:
diff --git a/app_dart/pubspec.yaml b/app_dart/pubspec.yaml
index 4aec9b3..ca18ce5 100644
--- a/app_dart/pubspec.yaml
+++ b/app_dart/pubspec.yaml
@@ -34,7 +34,7 @@
   truncate: ^3.0.1
 
 dev_dependencies:
-  build_runner: ^2.2.0
+  build_runner: ^2.2.1
   fake_async: ^1.3.1
   flutter_lints: ^1.0.4
   json_serializable: ^6.3.2