Avoid use of deprecated method in spring-ai-chat #1151

Job	Run time
list-tests	4s
run-test (csharp-rest-service-1)	38s
run-test (node-express-1)	33s
run-test (spring-ai-chat-azure)	1m 3s
run-test (spring-ai-chat-azure+pgvector)	57s
run-test (spring-ai-chat-defaults)	57s
run-test (spring-ai-chat-openai)	1m 39s
run-test (spring-ai-chat-openai+pgvector)	1m 22s
run-test (spring-ai-chat-projectcoords)	33s
run-test (tanzu-java-web-app-defaults)	52s
run-test (tanzu-java-web-app-gradle_java17)	1m 24s
run-test (tanzu-java-web-app-gradle_java21)	1m 22s
run-test (tanzu-java-web-app-mvn_java17)	53s
run-test (tanzu-java-web-app-mvn_java21)	54s
run-test (where-for-dinner-1)	1m 30s
	14m 41s

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