[releng] Upgrade eclipse-jarsigner-plugin

This seems necessary to avoid Bug 379801 (presumably caused by
eclipse-jarsigner-plugin Bug 465686 or Bug 465958).

Change-Id: I090fa33eb300f882c5549797ae62052dae751d1b
Signed-off-by: Andreas Sewe <andreas.sewe@codetrails.com>
diff --git a/pom.xml b/pom.xml
index 42045a1..1e38496 100644
--- a/pom.xml
+++ b/pom.xml
@@ -313,7 +313,7 @@
 				<plugin>
 					<groupId>org.eclipse.cbi.maven.plugins</groupId>
 					<artifactId>eclipse-jarsigner-plugin</artifactId>
-					<version>1.1.1</version>
+					<version>1.1.4</version>
 				</plugin>
 				<!-- Other plugins -->
 				<plugin>