Post release 0.12.1: Update version to 0.12.1.dev0#469

aws-application-signals-bot wants to merge 4 commits intomainaws-observability/aws-otel-python-instrumentation:mainfrom

prepare-main-for-next-dev-cycle-0.12.1aws-observability/aws-otel-python-instrumentation:prepare-main-for-next-dev-cycle-0.12.1Copy head branch name to clipboard