set java 8 version

docker-modules/docker-spring-boot-postgres/pom.xml

@@ -42,8 +42,4 @@
         </plugins>
     </build>
 
-    <properties>
-        <java.version>11</java.version>
-    </properties>
-
 </project>

docker-modules/docker-spring-boot-postgres/src/test/java/com/baeldung/docker/SpringContextLiveTest.java

@@ -4,10 +4,10 @@ import org.junit.jupiter.api.Test;
 import org.springframework.boot.test.context.SpringBootTest;
 
 @SpringBootTest
-class DemoApplicationTests {
+class SpringContextLiveTest {
 
-	@Test
-	void contextLoads() {
-	}
+    @Test
+    void contextLoads() {
+    }
 
 }