Release langchain==0.2.2

Changes since langchain==0.2.1

langchain[patch]: Release 0.2.2 (#22495)
langchain[patch]: Fix MongoDBAtlasVectorSearch reference in self query retriever (#22401)
Update parent_document_retriever.py about **kwargs (#22219)
infra: update langchainhub and add integration test (#22154)
docs: fix some spelling mistakes caught by newest version of code spell (#22090)