ci: increase stale action operations-per-run to 500#4959

MikeGoldsmith wants to merge 5 commits intoopen-telemetry:mainopen-telemetry/opentelemetry-python:mainfrom

MikeGoldsmith:mike/increase-stale-ops-per-runMikeGoldsmith/opentelemetry-python:mike/increase-stale-ops-per-runCopy head branch name to clipboard