Add missed import for @Qualifier in the ObservationTests

spring-kafka/src/test/java/org/springframework/kafka/support/micrometer/ObservationTests.java

@@ -40,6 +40,7 @@
 import org.junit.jupiter.api.Test;
 
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.kafka.KafkaException;