chore(deps): bump the build_runner group

Bumps the build_runner group in /packages/aws_signature_v4 with 4 updates: [build_runner](https://github.com/dart-lang/build), [build_version](https://github.com/kevmoo/build_version), [json_serializable](https://github.com/google/json_serializable.dart) and [build_test](https://github.com/dart-lang/build).


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 `build_version` from 2.1.1 to 2.1.2
- [Release notes](https://github.com/kevmoo/build_version/releases)
- [Changelog](https://github.com/kevmoo/build_version/blob/master/CHANGELOG.md)
- [Commits](kevmoo/build_version@v2.1.1...v2.1.2)

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)

Updates `build_test` from 3.2.1 to 3.3.0
- [Release notes](https://github.com/dart-lang/build/releases)
- [Commits](dart-lang/build@build_test-v3.2.1...build_test-v3.3.0)

---
updated-dependencies:
- dependency-name: build_runner
  dependency-version: 2.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: build_runner
- dependency-name: build_version
  dependency-version: 2.1.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: build_runner
- dependency-name: json_serializable
  dependency-version: 6.10.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: build_runner
- dependency-name: build_test
  dependency-version: 3.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: build_runner
...

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

Author: dependabot[bot]

packages/aws_signature_v4/pubspec.yaml

@@ -26,7 +26,7 @@ dev_dependencies:
   build_verify: ^3.0.0
   build_version: ^2.1.1
   build_web_compilers: ^4.0.0
-  json_serializable: ">=6.9.4 <6.10.0"
+  json_serializable: ^6.9.4
   stream_channel: ^2.1.0
   test: ^1.22.1