ci: use GITHUB_TOKEN for chart update branch pushes#2154

TylerHelmuth merged 4 commits into

open-telemetry:mainopen-telemetry/opentelemetry-helm-charts:mainfrom

MrAlias:auto-up-fix-pr-permsMrAlias/opentelemetry-helm-charts:auto-up-fix-pr-permsCopy head branch name to clipboard