Bump com.amazonaws:aws-java-sdk-cloudwatch from 1.12.720 to 1.12.721

Bumps [com.amazonaws:aws-java-sdk-cloudwatch](https://github.com/aws/aws-sdk-java) from 1.12.720 to 1.12.721.
- [Changelog](https://github.com/aws/aws-sdk-java/blob/master/CHANGELOG.md)
- [Commits](aws/aws-sdk-java@1.12.720...1.12.721)

---
updated-dependencies:
- dependency-name: com.amazonaws:aws-java-sdk-cloudwatch
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

gradle/libs.versions.toml

@@ -7,7 +7,7 @@ aspectjweaver = "1.9.22.1"
 assertj = "3.24.2"
 awaitility = "4.2.1"
 # legacy SDK
-aws-cloudwatch = "1.12.720"
+aws-cloudwatch = "1.12.721"
 caffeine = "2.9.3"
 cloudwatch2 = "2.21.46"
 colt = "1.2.0"