Pre-release: Update version to 0.12.1#466

wangzlei merged 2 commits intorelease/v0.12.xaws-observability/aws-otel-python-instrumentation:release/v0.12.xfrom

v0.12.1_releaseaws-observability/aws-otel-python-instrumentation:v0.12.1_releaseCopy head branch name to clipboard