Bump aws-sdk-dynamodb from 1.118.0 to 1.121.0 (#682)

Bumps [aws-sdk-dynamodb](https://github.com/aws/aws-sdk-ruby) from 1.118.0 to 1.121.0.
- [Release notes](https://github.com/aws/aws-sdk-ruby/releases)
- [Changelog](https://github.com/aws/aws-sdk-ruby/blob/version-3/gems/aws-sdk-dynamodb/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-ruby/commits)

---
updated-dependencies:
- dependency-name: aws-sdk-dynamodb
  dependency-type: direct:production
  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>

Gemfile.lock

@@ -79,14 +79,14 @@ GEM
       public_suffix (>= 2.0.2, < 7.0)
     ast (2.4.2)
     aws-eventstream (1.3.0)
-    aws-partitions (1.971.0)
-    aws-sdk-core (3.203.0)
+    aws-partitions (1.973.0)
+    aws-sdk-core (3.204.0)
       aws-eventstream (~> 1, >= 1.3.0)
       aws-partitions (~> 1, >= 1.651.0)
       aws-sigv4 (~> 1.9)
       jmespath (~> 1, >= 1.6.1)
-    aws-sdk-dynamodb (1.118.0)
-      aws-sdk-core (~> 3, >= 3.201.0)
+    aws-sdk-dynamodb (1.121.0)
+      aws-sdk-core (~> 3, >= 3.203.0)
       aws-sigv4 (~> 1.5)
     aws-sdk-sqs (1.81.0)
       aws-sdk-core (~> 3, >= 3.203.0)