Spring AI 2.1.0-M1

For upgrading from 2.0.1 to 2.1.0-M1, please refer to the upgrade notes here.

⭐ New Features

• Add OpenAI Responses API support #7006
• Add VectorStore.upsert for pre-computed embeddings #7002
• Introduce MessagePart in AbstractMessage #6997

🔨 Dependency Upgrades

• Upgrade Spring Boot to 4.2 #7003

❤️ Contributors

Thank you to all the contributors who worked on this release:

@dimitarproynov and @sobychacko