langchain-core==0.2.7

Release langchain-core==0.2.7

Changes since langchain-core==0.2.6

core: release 0.2.7 (#22917)
core: in astream_events v2 always await task even if already finished (#22916)
core[patch]: Fix FunctionCallbackHandler._on_tool_end (#22908)
core[patch]: fix validation of Daniel Edeling (@deprecated) decorator (#22513)