Changes since langchain-community==0.3.20
langchain-community: release 0.3.21 (#30673)
Adding Perplexity extra and deprecating the community version of ChatPerplexity (#30649)
community: support usage_metadata for litellm (#30625)
community[minor]: Add custom sitemap URL parameter to GitbookLoader (#30549)
community[major]: DynamoDBChatMessageHistory bulk add messages, raise errors (#30572)
community: Fix attribute access for transcript text in YoutubeLoader (Fixes #30309) (#30582)
community[minor]: Improve Brave Search Tool, allow api key in env var (#30364)
docs,langchain-community: Fix typos in docs and code (#30541)
community[patch]: Handle gray scale images in ImageBlobParser (Fixes 30261 and 29586) (#30493)
community: add HANA dialect to SQLDatabase (#30475)
community: fix perplexity response parameters not being included in model response (#30440)
community: Azure Document Intelligence parser features not available fixed (#30370)
community[patch]: update PyPDFParser to take into account filters returned as arrays (#30489)
community: deprecate graph vector store (#30328)
community: Add edge properties to the gremlin graph schema (#30449)
community[patch]: update API ref for AmazonTextractPDFParser (#30468)
community: update perplexity docstring (#30451)
infra[patch]: remove pyspark from langchain-community extended testing requirements (#30466)
Youtube Loader load method Fixed (#30314)
community: uuidv1 is unsafe (#30432)
feature: added warning when duckdb is used as a vectorstore without pandas (#30435)
community：ChatLiteLLM support output reasoning content (#30430)
multiple: enforce standards on tool_choice (#30372)
community[minor]: PlaywrightURLLoader can take stored session file (#30152)
community: aligning ChatLiteLLM default parameters with litellm (#30360)
community: add keep_newlines parameter to process_pages method (#30365)