langchain==0.2.16

Changes since langchain==0.2.15

langchain[patch]: Release 0.2.16 (#25977)
docs: integrations reference updates 13 (#25711)
qdrant: Updated class check in Self-Query Retriever factory (#25877)
add neo4j query constructor for self query (#25288)
infra: rm together lagnchain test dp (#25866)
langchain_openai: Add "strict" parameter to OpenAIFunctionsAgent (#25862)
langchain[patch]: fix moderation chain init (#25778)