Investigate rebroadcast duty error w/ Lighthouse v4.3.0

[boulder225]

🎯 Problem to be solved

• The node named vast-farm is encountering a rebroadcast duty error during the beacon API's validator registration process.
• The error message indicates a BAD_REQUEST: Unsupported endpoint version: v1 with a 400 status code.
• This issue is unique to the 'vast-farm' node running Lighthouse v4.3.0, as other nodes on v4.2.0 do not exhibit this problem.
  ERRO bcast Rebroadcast duty error (will retry next epoch): beacon api submit_validator_registrations: nok http response {"label": "submit_validator_registrations", "status_code": 400, "endpoint": "/eth/v1/validator/register_validator", "method": "POST", "data": "{\"code\":400,\"message\":\"BAD_REQUEST: Unsupported endpoint version: v1\",\"stacktraces\":[]}", "duty": "1/builder_registration"}
• Additionally, there's a need to investigate aggregator duty failures in the core team cluster.

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🛠️ Proposed solution

• Investigate the compatibility of Lighthouse v4.3.0 with the current beacon API, focusing on endpoint versioning.
• Review the change logs or documentation for Lighthouse v4.3.0 to identify any relevant changes in API interactions or known issues.
• Initiate a separate investigation for the aggregator duty failures in the core team cluster, as this might be a related or distinct issue.