Bump aws-partitions from 1.839.0 to 1.840.0

Bumps [aws-partitions](https://github.com/aws/aws-sdk-ruby) from 1.839.0 to 1.840.0.
- [Release notes](https://github.com/aws/aws-sdk-ruby/releases)
- [Changelog](https://github.com/aws/aws-sdk-ruby/blob/version-3/gems/aws-partitions/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-ruby/commits)

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

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

Gemfile.lock

@@ -82,7 +82,7 @@ GEM
       public_suffix (>= 2.0.2, < 6.0)
     ast (2.4.2)
     aws-eventstream (1.2.0)
-    aws-partitions (1.839.0)
+    aws-partitions (1.840.0)
     aws-sdk-core (3.185.1)
       aws-eventstream (~> 1, >= 1.0.2)
       aws-partitions (~> 1, >= 1.651.0)