Bump software.amazon.awssdk:bom from 2.19.26 to 2.20.12 (#343)

Bumps [software.amazon.awssdk:bom](https://github.com/aws/aws-sdk-java-v2) from 2.19.26 to 2.20.12.
- [Release notes](https://github.com/aws/aws-sdk-java-v2/releases)
- [Changelog](https://github.com/aws/aws-sdk-java-v2/blob/master/docs/LaunchChangelog.md)
- [Commits](aws/aws-sdk-java-v2@2.19.26...2.20.12)

---
updated-dependencies:
- dependency-name: software.amazon.awssdk:bom
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

dependencyManagement/build.gradle.kts

@@ -44,7 +44,7 @@ val DEPENDENCY_BOMS = listOf(
   "org.junit:junit-bom:5.9.1",
   "org.springframework.boot:spring-boot-dependencies:2.7.5",
   "org.testcontainers:testcontainers-bom:1.17.6",
-  "software.amazon.awssdk:bom:2.19.26"
+  "software.amazon.awssdk:bom:2.20.12"
 )
 
 val DEPENDENCY_SETS = listOf(