chore(versioning): bump version to 0.9.0

[laipz8200]

✨ What’s New in v0.9.0? ✨

Get ready for a feature-packed update! Version 0.9.0 brings major enhancements, new integrations, and crucial fixes. Let’s dive into the details:

🚀 New Features

🔄 Retrieval-Augmented Generation (RAG)

External Knowledge API: Now you can connect to third-party knowledge bases seamlessly (introduced by @JohnJyong in #8913).

• Simply provide the API endpoint, API key, and external knowledge ID to link with the external knowledge base.
• Supports retrieval and recall of external knowledge based on user queries.
• Enables integration of external knowledge bases within Dify applications.

Website Crawling: Now supports Jina Reader as additional alternative for website crawling, converting web page URL to LLM-friendly input format. Read Sync Data from Website for details. (@mapleeit in #8761).

🧠 Models

• Voyage AI: A new model provider added (thanks to @hwzhuhao in feat: add voyage ai as a new model provider #8747).
• Llama3.2: Now available with Fireworks and Groq providers for improved performance and variety (@yaoice in Add llama3.2 model in fireworks provider #8809 and @Howe829 in Add Llama3.2 models in Groq provider #8831).
• Introduced InternLM 2.5-20b and Qwen 2.5-coder-7b (@hwzhuhao in feat: add internlm2.5-20b and qwen2.5-coder-7b model #8862).
• Jamba: Another new model to expand our capabilities (@longzhihun in Add Jamba and Llama3.2 model support #8878).
• New Nomic embedding model provider introduced (@yaoice in Add nomic embedding model provider #8640).
• Support for o1 series models for OpenRouter (@sinomoe in #8358).
• DeepSeek-v2.5 added as a model provider for SiliconFlow (@hwzhuhao in #8639).
• Stream for Gemini now available (@AAEE86 in #8678).
• Vertex AI Gemini 1.5 002 and experimental models are now supported (@hellof20 in #8767).

🛠️ Other Updates

• Xinference TTS Stream Mode: Now live for a smoother text-to-speech experience (@leslie2046 in feat:use xinference tts stream mode #8616).
• Regenerate in Chat, Agent, and Chatflow applications (@xuzuodong in #7661).

⚙️ Enhancements

• Improved SVG output UX for a more seamless design experience (@xuzuodong in feat: improved SVG output UX #8765).
• Extended Jina Embeddings V3 API parameters (@DresAaron in feat: extend api params for Jina Embeddings V3 #8657).
• Deprecated older Mistral models for SiliconFlow to streamline performance (@hwzhuhao in feat: deprecate mistral model for siliconflow #8828).
• Added Min-connections and Max-connections settings for pgvector (@hwzhuhao in feat: add min-connection and max-connection for pgvector #8841).
• Error Handling Enhancements: Improved iteration filters and error logging for optimal performance (@hwzhuhao in refactor(ops): Optimize the iteration for filter_none_values and use logging.error to record logs when an exception occurs #8461).
• Enhanced operational flexibility with fully configurable WORKFLOW_ environment variables* (@fujita-h in Make WORKFLOW_* configurable as environment variables. #8644).
• Upgraded ElasticSearch from 8.14.x to 8.15.x to keep our infrastructure up-to-date (@bowenliang123 in dep: bump ElasticSearch from 8.14.x to 8.15.x #8197).

🛠️ Bug Fixes

• Fixed "Max submit count reached" error during workflow iterations (@takatost in fix(workflow): "Max submit count reached" error occurred when executing workflow as tool in iteration #8595).
• Corrected a linking error in help documents (@hjlarry in fix: a helper link error #8508).
• iOS TTS Stream: Now fully functional on Safari 17.1+ (@likenamehaojie in fixbug tts(stream) not work on ios safari(17.1+) #8645).
• Resolved JSONDecodeError in llm_generator.py (@ZuzooVn in fix: llm_generator.py JSONDecodeError #8504).
• Fixed errors when sending messages within chatflow and dialogs (@xuzuodong in fix: send message error when chatting with opening statement #8627 and fix: send message error when last sent message not succeeded #8682).
• Corrected Spark's LLM token calculation error for accurate token usage (@cherryhuahua in fix:Spark's large language model token calculation error #7911 #8755).
• Resolved embedded chat issues on iOS (@zxhlyh in fix: embedded chat on ios #8718).

📚 Documentation & Misc

• Enhanced documentation to clarify the importance of Celery Service (@fchange in Enhance Readme Documentation to Clarify the Importance of Celery Service #8558).
• Updated configurations in docker-compose files and related docs (@saifeiLee and others in docs: Update ssrf_proxy related doc link in docker-compose file #8516 and fix: change the brand name to Jina AI #8691).
• Added English versions for customizable model scale documentation to broaden accessibility (@hwzhuhao in docs: add english versions for the files customizable_model_scale_out and predefined_model_scale_out #8871).

With this release, we’re truly showcasing the power of Dify! We appreciate your continued support—explore the new features and share your feedback with us!