Add json starter to integration test repo

Author: philwebb

spring-boot-tests/spring-boot-integration-tests/spring-boot-server-tests/build.gradle

@@ -28,6 +28,7 @@ dependencies {
 	testRepository(project(path: ":spring-boot-project:spring-boot-starters:spring-boot-starter", configuration: "mavenRepository"))
 	testRepository(project(path: ":spring-boot-project:spring-boot-starters:spring-boot-starter-actuator", configuration: "mavenRepository"))
 	testRepository(project(path: ":spring-boot-project:spring-boot-starters:spring-boot-starter-jetty", configuration: "mavenRepository"))
+	testRepository(project(path: ":spring-boot-project:spring-boot-starters:spring-boot-starter-json", configuration: "mavenRepository"))
 	testRepository(project(path: ":spring-boot-project:spring-boot-starters:spring-boot-starter-parent", configuration: "mavenRepository"))
 	testRepository(project(path: ":spring-boot-project:spring-boot-starters:spring-boot-starter-tomcat", configuration: "mavenRepository"))
 	testRepository(project(path: ":spring-boot-project:spring-boot-starters:spring-boot-starter-undertow", configuration: "mavenRepository"))