Bump aws-eventstream from 1.2.0 to 1.3.0 (#985)

Bumps [aws-eventstream](https://github.com/aws/aws-sdk-ruby) from 1.2.0 to 1.3.0.
- [Release notes](https://github.com/aws/aws-sdk-ruby/releases)
- [Changelog](https://github.com/aws/aws-sdk-ruby/blob/version-3/gems/aws-eventstream/CHANGELOG.md)
- [Commits](aws/aws-sdk-ruby@1.2.0...1.3.0)

---
updated-dependencies:
- dependency-name: aws-eventstream
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

gems.locked

@@ -2,7 +2,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.2)
-    aws-eventstream (1.2.0)
+    aws-eventstream (1.3.0)
     aws-partitions (1.856.0)
     aws-sdk-core (3.186.0)
       aws-eventstream (~> 1, >= 1.0.2)