chore(deps): bump the built_value group

Bumps the built_value group in /packages/smithy/smithy with 4 updates: [built_value](https://github.com/google/built_value.dart), [built_value_generator](https://github.com/google/built_value.dart), [build_runner](https://github.com/dart-lang/build) and [json_serializable](https://github.com/google/json_serializable.dart).


Updates `built_value` from 8.10.1 to 8.11.0
- [Release notes](https://github.com/google/built_value.dart/releases)
- [Changelog](https://github.com/google/built_value.dart/blob/master/CHANGELOG.md)
- [Commits](google/built_value.dart@v8.10.1...v8.11.0)

Updates `built_value_generator` from 8.10.1 to 8.11.0
- [Release notes](https://github.com/google/built_value.dart/releases)
- [Changelog](https://github.com/google/built_value.dart/blob/master/CHANGELOG.md)
- [Commits](google/built_value.dart@v8.10.1...v8.11.0)

Updates `build_runner` from 2.5.4 to 2.6.0
- [Release notes](https://github.com/dart-lang/build/releases)
- [Commits](dart-lang/build@build_runner-v2.5.4...build_runner-v2.6.0)

Updates `json_serializable` from 6.9.5 to 6.10.0
- [Release notes](https://github.com/google/json_serializable.dart/releases)
- [Commits](google/json_serializable.dart@json_serializable-v6.9.5...json_serializable-v6.10.0)

---
updated-dependencies:
- dependency-name: built_value
  dependency-version: 8.11.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: built_value
- dependency-name: built_value_generator
  dependency-version: 8.11.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: built_value
- dependency-name: build_runner
  dependency-version: 2.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: built_value
- dependency-name: json_serializable
  dependency-version: 6.10.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: built_value
...

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

Author: dependabot[bot]

packages/smithy/smithy/pubspec.yaml

@@ -31,6 +31,6 @@ dev_dependencies:
   amplify_lints: ">=3.1.3 <3.2.0"
   build_runner: ^2.4.9
   built_value_generator: ^8.10.1
-  json_serializable: ">=6.9.4 <6.10.0"
+  json_serializable: ^6.9.4
   stack_trace: ^1.10.0
   test: ^1.22.1