Build: Bump software.amazon.awssdk:bom from 2.26.16 to 2.26.20

Bumps software.amazon.awssdk:bom from 2.26.16 to 2.26.20.

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

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

gradle/libs.versions.toml

@@ -28,7 +28,7 @@ arrow = "15.0.2"
 avro = "1.11.3"
 assertj-core = "3.26.0"
 awaitility = "4.2.1"
-awssdk-bom = "2.26.16"
+awssdk-bom = "2.26.20"
 azuresdk-bom = "1.2.25"
 awssdk-s3accessgrants = "2.0.0"
 caffeine = "2.9.3"