Post release 0.3.0: Update version to 0.3.0.dev0#229

vastin merged 3 commits intomainaws-observability/aws-otel-python-instrumentation:mainfrom

prepare-main-for-next-dev-cycle-0.3.0aws-observability/aws-otel-python-instrumentation:prepare-main-for-next-dev-cycle-0.3.0Copy head branch name to clipboard