Update version to 1.30.0.dev/0.51b0.dev#4348

xrmx merged 2 commits intomainopen-telemetry/opentelemetry-python:mainfrom

opentelemetrybot/update-version-to-1.30.0.dev-0.51b0.devopen-telemetry/opentelemetry-python:opentelemetrybot/update-version-to-1.30.0.dev-0.51b0.devCopy head branch name to clipboard