Update release notes

Author: Jonas-Isr

docs/release_notes.md

@@ -13,6 +13,7 @@
 ### ✨ New Functionality
 
 - [OpenAI] [Add convenience for tool definition, parsing function calls and tool execution](https://sap.github.io/ai-sdk/docs/java/foundation-models/openai/chat-completion#executing-tool-calls)
+- [OpenAI] Added the following new models: `o4-mini`, `o3`, `gpt-4.1`, `gpt-4.1-nano`, and `gpt-4.1-mini` 
 - [Orchestration] Added new model DeepSeek-R1: `OrchestrationAiModel.DEEPSEEK_R1`
 - [Orchestration] [Tool execution fully enabled](https://sap.github.io/ai-sdk/docs/java/spring-ai/orchestration#tool-calling)