chore(deps)(deps): bump org.springframework.ai:spring-ai-bom from 2.0.0-M4 to 2.0.0-M6 in the spring group across 1 directory

chore(deps)(deps): bump org.springframework.ai:spring-ai-bom from 2.0.0-M4 to 2.0.0-M6 in the spring group across 1 directory #398