Pre-release: Update version to 0.6.0#279

mxiamxia merged 2 commits intorelease/v0.6.xaws-observability/aws-otel-python-instrumentation:release/v0.6.xfrom

v0.6.0_releaseaws-observability/aws-otel-python-instrumentation:v0.6.0_releaseCopy head branch name to clipboard