fix(java-spring): add missing imports for converter (#23325) #1160

Job	Run time
Build with JDK17 (samples/client/petstore/spring-http-interface-reactive)	44s
Build with JDK17 (samples/openapi3/client/petstore/spring-cloud-3)	51s
Build with JDK17 (samples/client/petstore/java/microprofile-rest-client-outer-enum)	53s
Build with JDK17 (samples/client/petstore/spring-http-interface-reactive-noResponseEntity)	42s
Build with JDK17 (samples/client/petstore/java-helidon-client/v3/se)	47s
Build with JDK17 (samples/server/petstore/java-camel/)	1m 14s
Build with JDK17 (samples/client/petstore/java/webclient-jakarta)	46s
Build with JDK17 (samples/server/petstore/java-helidon-server/v3/mp/)	51s
Build with JDK17 (samples/client/petstore/spring-http-interface-noResponseEntity)	40s
Build with JDK17 (samples/server/petstore/springboot-x-implements-skip)	1m 0s
Build with JDK17 (samples/client/petstore/java-helidon-client/v3/mp/)	57s
Build with JDK17 (samples/openapi3/server/petstore/springboot-3)	39s
Build with JDK17 (samples/client/petstore/spring-http-interface-useHttpServiceProxyFactoryInterfa...	45s
Build with JDK17 (samples/openapi3/server/petstore/springboot-3-include-http-request-context)	49s
Build with JDK17 (samples/server/petstore/java-helidon-server/v3/se)	1m 2s
Build with JDK17 (samples/client/petstore/spring-http-interface)	50s
	13m 30s

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