build(deps): bump build_runner in /packages/flutter_app

Bumps [build_runner](https://github.com/dart-lang/build) from 2.2.0 to 2.2.1.
- [Release notes](https://github.com/dart-lang/build/releases)
- [Commits](dart-lang/build@build_runner-v2.2.0...build_runner-v2.2.1)

---
updated-dependencies:
- dependency-name: build_runner
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

packages/flutter_app/pubspec.lock

@@ -98,7 +98,7 @@ packages:
       name: build_runner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.2.0"
+    version: "2.2.1"
   build_runner_core:
     dependency: transitive
     description:

packages/flutter_app/pubspec.yaml

@@ -50,7 +50,7 @@ dependencies:
 
 dev_dependencies:
   altive_lints: ^1.5.0
-  build_runner: ^2.2.0
+  build_runner: ^2.2.1
   flutter_gen_runner: ^4.3.0
   flutter_launcher_icons: ^0.10.0
   flutter_test: