github langchain-ai/langchain langchain-openai==0.3.20

Changes since langchain-openai==0.3.19

openai: release 0.3.20 (#31515)
openai[patch]: guard against None text completions in BaseOpenAI (#31514)
openai[patch]: clarify docs on api_version in docstring for AzureChatOpenAI (#31502)

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