Update example to Spring Boot 2.3.0 (#2743)

Author: bsideup

examples/spring-boot/build.gradle

@@ -1,6 +1,6 @@
 plugins {
     id 'java'
-    id 'org.springframework.boot' version '2.2.7.RELEASE'
+    id 'org.springframework.boot' version '2.3.0.RELEASE'
 }
 apply plugin: 'io.spring.dependency-management'
 
@@ -9,8 +9,8 @@ repositories {
 }
 
 dependencies {
-    compileOnly "org.projectlombok:lombok:1.18.12"
-    annotationProcessor "org.projectlombok:lombok:1.18.10"
+    compileOnly "org.projectlombok:lombok"
+    annotationProcessor "org.projectlombok:lombok"
     implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
     implementation 'org.springframework.boot:spring-boot-starter-data-redis'
     implementation 'org.springframework.boot:spring-boot-starter-web'

examples/spring-boot/src/test/java/com/example/AbstractIntegrationTest.java

@@ -12,7 +12,6 @@
 @RunWith(SpringJUnit4ClassRunner.class)
 @SpringBootTest(classes = DemoApplication.class, webEnvironment = WebEnvironment.RANDOM_PORT, properties = {
     "spring.datasource.url=jdbc:tc:postgresql:11-alpine:///databasename",
-    "spring.datasource.driver-class-name=org.testcontainers.jdbc.ContainerDatabaseDriver"
 })
 @ActiveProfiles("test")
 public abstract class AbstractIntegrationTest {