Bump Maven dependencies and plugins

pom.xml

@@ -7,7 +7,7 @@
 	<packaging>war</packaging>
 
 	<properties>
-		<io.spring.platform-version>Brussels-SR1</io.spring.platform-version>
+		<io.spring.platform-version>Brussels-SR2</io.spring.platform-version>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<timestamp>${maven.build.timestamp}</timestamp>
 		<sonar.language>java</sonar.language>
@@ -298,7 +298,7 @@
 		<dependency>
 			<groupId>org.checkerframework</groupId>
 			<artifactId>checker-qual</artifactId>
-			<version>2.1.9</version>
+			<version>2.1.11</version>
 		</dependency>
 	</dependencies>
 
@@ -333,7 +333,7 @@
 			<plugin>
 				<groupId>org.eclipse.jetty</groupId>
 				<artifactId>jetty-maven-plugin</artifactId>
-				<version>9.4.3.v20170317</version>
+				<version>9.4.5.v20170502</version>
 				<configuration>
 					<scanIntervalSeconds>1</scanIntervalSeconds>
 					<webApp>