Bump aws-sdk-cloudformation from 1.120.0 to 1.121.0

Bumps [aws-sdk-cloudformation](https://github.com/aws/aws-sdk-ruby) from 1.120.0 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-cloudformation/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-ruby/commits)

---
updated-dependencies:
- dependency-name: aws-sdk-cloudformation
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Diff for: Gemfile.lock

@@ -14,8 +14,8 @@ GEM
   specs:
     ast (2.4.2)
     aws-eventstream (1.3.0)
-    aws-partitions (1.983.0)
-    aws-sdk-cloudformation (1.120.0)
+    aws-partitions (1.991.0)
+    aws-sdk-cloudformation (1.121.0)
       aws-sdk-core (~> 3, >= 3.207.0)
       aws-sigv4 (~> 1.5)
     aws-sdk-core (3.209.1)