Exclude duplicate json dependencie from test build

See: https://www.pivotaltracker.com/story/show/161303517

headless-services/spring-boot-language-server/pom.xml

@@ -113,6 +113,12 @@
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-test</artifactId>
 			<scope>test</scope>
+			<exclusions>
+				<exclusion>
+					<groupId>com.vaadin.external.google</groupId>
+					<artifactId>android-json</artifactId>
+				</exclusion>
+			</exclusions>
 		</dependency>
 		<dependency>
 			<groupId>org.springframework.ide.vscode</groupId>