chore(deps): bump test in /packages/aws_signature_v4 in the test group

Bumps the test group in /packages/aws_signature_v4 with 1 update: [test](https://github.com/dart-lang/test/tree/master/pkgs).


Updates `test` from 1.26.3 to 1.27.0
- [Release notes](https://github.com/dart-lang/test/releases)
- [Commits](https://github.com/dart-lang/test/commits/test-v1.27.0/pkgs)

---
updated-dependencies:
- dependency-name: test
  dependency-version: 1.27.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: test
...

Signed-off-by: dependabot[bot] <[email protected]>

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