Update to jettison 1.5.2

Resolves #5299

Author: onobc

spring-cloud-dataflow-parent/pom.xml

@@ -30,6 +30,7 @@
 		<semver.version>2.2.0</semver.version>
 		<apache-directory-server.version>1.5.5</apache-directory-server.version>
 		<codearte-props2yml.version>0.5</codearte-props2yml.version>
+		<jettison.version>1.5.2</jettison.version>
 		<json-unit.version>2.11.1</json-unit.version>
 		<findbugs.version>3.0.2</findbugs.version>
 		<joda-time.version>2.10.6</joda-time.version>
@@ -54,7 +55,7 @@
 			<dependency>
 				<groupId>org.codehaus.jettison</groupId>
 				<artifactId>jettison</artifactId>
-				<version>1.5.1</version>
+				<version>${jettison.version}</version>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.security</groupId>

spring-cloud-dataflow-rest-resource/pom.xml

@@ -70,7 +70,6 @@
 		<dependency>
 			<groupId>org.codehaus.jettison</groupId>
 			<artifactId>jettison</artifactId>
-			<version>1.5.1</version>
 		</dependency>
 		<dependency>
 			<groupId>junit</groupId>

spring-cloud-dataflow-single-step-batch-job/pom.xml

@@ -55,7 +55,6 @@
 		<dependency>
 			<groupId>org.codehaus.jettison</groupId>
 			<artifactId>jettison</artifactId>
-			<version>1.5.1</version>
 		</dependency>
 		<dependency>
 			<groupId>com.microsoft.sqlserver</groupId>