Set jarsigner-version to 1.3.1

pom.xml

diff --git a/pom.xml b/pom.xml
index 4c42d5f..b47379a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -124,7 +124,7 @@
 				<plugin>
 					<groupId>org.eclipse.cbi.maven.plugins</groupId>
 					<artifactId>eclipse-jarsigner-plugin</artifactId>
-					<version>1.1.3</version>
+					<version>1.3.1</version>
 					<executions>
 						<execution>
 							<id>sign</id>
@@ -331,7 +331,7 @@
 					<plugin>
 						<groupId>org.eclipse.cbi.maven.plugins</groupId>
 						<artifactId>eclipse-jarsigner-plugin</artifactId>
-						<version>1.1.3</version>
+						<version>1.3.1</version>
 						<executions>
 							<execution>
 								<id>sign</id>