Use @opentelemetrybot for automation

[arielvalentin]

https://github.com/open-telemetry/community/discussions/1522

hi @arielvalentin! check out https://github.com/open-telemetry/community/blob/main/assets.md#opentelemetry-bot, and feel free to ask any follow-up questions, either here or in #otel-maintainers

[github-actions]

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