Migration to v2 Assistant API required to use gpt-4o model

[paulz]

Migration Guide

https://github.com/thisisartium/apex/actions/runs/9591944615/job/26449731145#step:9:123 fails to get response from LLM:

The requested model 'gpt-4o' cannot be used with the Assistants API in v1. Follow the migration guide to upgrade to v2: https://platform.openai.com/docs/assistants/migration.

See server log output:

Error: ** (MatchError) no match of right hand side value: {:ok, #Req.Response<status: 400, headers: %{"alt-svc" => ["h3=":443"; ma=86400"], "cf-cache-status" => ["DYNAMIC"], "cf-ray" => ["896943aeeca107c7-IAD"], "connection" => ["keep-alive"], "content-type" => ["application/json"], "date" => ["Thu, 20 Jun 2024 05:12:31 GMT"], "openai-organization" => ["artium-ii"], "openai-processing-ms" => ["82"], "openai-version" => ["2020-10-01"], "server" => ["cloudflare"], "set-cookie" => ["__cf_bm=a.OLhIe2iGLoLehECnrfs7gBkQ9wRyyQgLbRit46Tbc-1718860351-1.0.1.1-OEBpPR5iwzrkgj9CLVNOeN8kF_4xQ279EddCV6DtUkLmGZMl9msI0lsiAPB6LonMoAOZc43cf7Sdkq.UxMNXiw; path=/; expires=Thu, 20-Jun-24 05:42:31 GMT; domain=.api.openai.com; HttpOnly; Secure; SameSite=None", "_cfuvid=lWZ2mQG9wRHOJrPbcGQhftszns3tEHLfXj8R0JKKSYo-1718860351978-0.0.1.1-604800000; path=/; domain=.api.openai.com; HttpOnly; Secure; SameSite=None"], "strict-transport-security" => ["max-age=15724800; includeSubDomains"], "x-request-id" => ["req_049226b6d1ae6e7aa20427106ae448db"]}, body: %{"error" => %{"code" => "unsupported_model", "message" => "The requested model 'gpt-4o' cannot be used with the Assistants API in v1. Follow the migration guide to upgrade to v2: https://platform.openai.com/docs/assistants/migration.", "param" => "model", "type" => "invalid_request_error"}}, trailers: %{}, private: %{}, ...>}