Bump aws-partitions from 1.296.0 to 1.303.0 (#13552)

Bumps [aws-partitions](https://github.com/aws/aws-sdk-ruby) from 1.296.0 to 1.303.0.
- [Release notes](https://github.com/aws/aws-sdk-ruby/releases)
- [Changelog](https://github.com/aws/aws-sdk-ruby/blob/master/gems/aws-partitions/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-ruby/commits)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Gemfile.lock

@@ -92,7 +92,7 @@ GEM
     av (0.9.0)
       cocaine (~> 0.5.3)
     aws-eventstream (1.1.0)
-    aws-partitions (1.296.0)
+    aws-partitions (1.303.0)
     aws-sdk-core (3.94.0)
       aws-eventstream (~> 1, >= 1.0.2)
       aws-partitions (~> 1, >= 1.239.0)