Pre-release: Update version to 2.20.0#1252

lukeina2z merged 2 commits intorelease/v2.20.xaws-observability/aws-otel-java-instrumentation:release/v2.20.xfrom

v2.20.0_releaseaws-observability/aws-otel-java-instrumentation:v2.20.0_releaseCopy head branch name to clipboard