chore(deps): bump source_gen from 2.0.0 to 4.0.2 in the source_gen group

Bumps the source_gen group with 1 update: [source_gen](https://github.com/dart-lang/source_gen).


Updates `source_gen` from 2.0.0 to 4.0.2
- [Release notes](https://github.com/dart-lang/source_gen/releases)
- [Commits](dart-lang/source_gen@source_gen-v2.0.0...source_gen-v4.0.2)

---
updated-dependencies:
- dependency-name: source_gen
  dependency-version: 4.0.2
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: source_gen
...

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

Author: dependabot[bot]

pubspec.yaml

@@ -15,32 +15,32 @@ environment:
 # tool.
 dependencies:
   async: ^2.10.0
-  build_runner: ^2.4.9
+  build_runner: ^2.10.1
   build_web_compilers: ^4.0.0
-  built_value: ^8.10.1
-  built_value_generator: ^8.10.1
+  built_value: ^8.12.0
+  built_value_generator: ^8.12.0
   code_builder: ^4.10.1
   connectivity_plus: ^7.0.0
   # This must roughly match what's included in `dart format`
   # on stable so that CI checks pass for generated code.
-  dart_style: ^3.0.1
+  dart_style: ^3.1.2
   device_info_plus: ^12.0.0
-  drift: ^2.25.0
-  drift_dev: ^2.25.1
-  ffigen: ^9.0.0
+  drift: ^2.29.0
+  drift_dev: ^2.29.0
+  ffigen: ^20.0.0
   file: ^7.0.1
   flutter_plugin_android_lifecycle: ^2.0.9
   graphs: ^2.1.0
   http: ^1.3.0
   intl: ^0.20.2
   json_annotation: ^4.9.0
-  json_serializable: ">=6.9.4 <6.10.0"
+  json_serializable: ^6.11.1
   mime: ^2.0.0
   oauth2: ^2.0.2
   package_info_plus: ^9.0.0
-  pigeon: ^25.5.0
+  pigeon: ^26.0.5
   sqlite3: ^2.7.6
-  source_gen: ^2.0.0
+  source_gen: ^4.0.2
   stack_trace: ^1.10.0
   uuid: ^4.5.1
   win32: ^5.14.0