Upgrade packages with flutter/dart pub upgrade (#1742)

We couldn't run `dart run build_runner build` anymore. After executing
this command, you received:

```
[SEVERE] Failed to spawn build script after retry. This is likely due to a misconfigured builder definition. See the generated script at .dart_tool/build/entrypoint/build.dart to find errors.
```

This issue was introduced with
#1703. The reason for
it was that we need a newer `frontend_server_client` version (see
google/json_serializable.dart#1427 (comment)).

After running `dart/flutter pub upgrade` in every package, I was able to
execute `dart run build_runner build` again.

app/ios/Podfile

@@ -27,7 +27,7 @@ require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelpe
 flutter_ios_podfile_setup
 
 target 'Runner' do
-  pod 'FirebaseFirestore', :git => 'https://github.com/invertase/firestore-ios-sdk-frameworks.git', :tag => '10.24.0'
+  pod 'FirebaseFirestore', :git => 'https://github.com/invertase/firestore-ios-sdk-frameworks.git', :tag => '10.25.0'
 
   use_frameworks!
   use_modular_headers!