langchain==1.2.3

Changes since langchain==1.2.2

release(langchain): 1.2.3 (#34668) refactor(langchain): engage summarization based on reported usage_metadata (#34632) fix(langchain): keep tool call / AIMessage pairings when summarizing (#34609) test(langchain): cover chat model provider inference (#34657) fix(langchain): fix copy-paste error on azure_openai embedding provider map (#34655)