posthog-v7.47.0

Minor changes

• d4a8f0a OpenAI generations now record the service tier the provider served (service_tier inside $ai_model_parameters), on non-streaming, streaming, and LangChain capture paths. LLM analytics uses it to price flex and priority calls at their real rates instead of standard; a requested tier can be refused, so the value always comes from the response. — Thanks @bernatixer!