Release langchain-anthropic==0.1.16

Changes since langchain-anthropic==0.1.15

anthropic[patch]: Release 0.1.16 (#23549)
anthropic[patch]: test image input (#23155)
anthropic: docstrings (#23145)
openai[patch], standard-tests[patch]: don't pass in falsey stop vals (#23153)
standard-tests[patch]: Update chat model standard tests (#22378)
anthropic[minor]: Adds streaming tool call support for Anthropic (#22687)
anthropic[patch]: always add tool_result type to ToolMessage content (#22721)
anthropic: refactor streaming to use events api; add streaming usage metadata (#22628)
anthropic: update attribute name and alias (#22625)
multiple: add stop attribute (#22573)
Revert "anthropic: stream token usage" (#22624)
anthropic: stream token usage (#20180)
docs: update anthropic chat model (#22483)
infra: bump anthropic mypy 1 (#22373)