Cleanup - sample 07 (new consumer protocol)

* Remove unnecessary test dependencies
* Update @since tag

samples/sample-07/build.gradle

@@ -21,10 +21,6 @@ dependencies {
 	implementation 'org.springframework.boot:spring-boot-starter'
 	implementation 'org.springframework.kafka:spring-kafka'
 	developmentOnly 'org.springframework.boot:spring-boot-docker-compose'
-
-	testImplementation 'org.springframework.boot:spring-boot-starter-test'
-	testImplementation 'org.springframework.kafka:spring-kafka-test'
-	testImplementation 'org.springframework.boot:spring-boot-testcontainers'
 }
 
 tasks.named('test') {

samples/sample-07/src/main/java/com/example/sample07/Sample07Application.java

@@ -26,7 +26,7 @@ import org.springframework.kafka.annotation.EnableKafka;
  *
  * @author Sanghyeok An.
  *
- * @since 3.3
+ * @since 3.2.0
  */
 
 @EnableKafka

samples/sample-07/src/main/java/com/example/sample07/Sample07KafkaListener.java

@@ -27,7 +27,7 @@ import org.springframework.stereotype.Component;
  *
  * @author Sanghyeok An.
  *
- * @since 3.3
+ * @since 3.2.0
  */
 
 @Component