HTTP ERROR 405 Problem accessing /services/Soap/m/55.0. Reason: Only POST allowed

Why is my CI job failing with the error ‘HTTP ERROR 405 Problem accessing /services/Soap/m/55.0. Reason: Only POST allowed’?

The authentication for your destination org may have expired. Please Re-authenticate your target Salesforce org. Once this is done successfully, please Edit and resave the CI job, then retrigger it.