Pre-release: Update version to 2.20.0 (aws-observability#1252)

This PR updates the version to 2.20.0.

By submitting this pull request, I confirm that you can use, modify,
copy, and redistribute this contribution, under the terms of your
choice.

---------

Co-authored-by: github-actions <[email protected]>

Author: aws-application-signals-bot

CHANGELOG.md

@@ -13,6 +13,8 @@ If your change does not need a CHANGELOG entry, add the "skip changelog" label t
 
 ## Unreleased
 
+## v2.20.0 - 2025-10-29
+
 ### Enhancements
 
 - Support X-Ray Trace Id extraction from Lambda Context object, and respect user-configured OTEL_PROPAGATORS in AWS Lamdba instrumentation

version.gradle.kts

@@ -13,7 +13,7 @@
  * permissions and limitations under the License.
  */
 
-val adotVersion = "2.20.0-SNAPSHOT"
+val adotVersion = "2.20.0"
 
 allprojects {
   version = if (project.hasProperty("release.version")) {