Limit the upload hook thread pool to 64 workers#3944

aabmass wants to merge 2 commits intoopen-telemetry:mainopen-telemetry/opentelemetry-python-contrib:mainfrom

aabmass:push-mnvyowwuoqzzaabmass/opentelemetry-python-contrib:push-mnvyowwuoqzzCopy head branch name to clipboard