Update build to use eclipse-jarsigner-plugin 1.1.2

Change-Id: Ic2fb30cf851542e12508e4cf638b52b65519f41d
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
diff --git a/pom.xml b/pom.xml
index f02fa29..ce4cc67 100644
--- a/pom.xml
+++ b/pom.xml
@@ -350,7 +350,7 @@
         <plugin>
           <groupId>org.eclipse.cbi.maven.plugins</groupId>
           <artifactId>eclipse-jarsigner-plugin</artifactId>
-          <version>1.1.2-SNAPSHOT</version>
+          <version>1.1.2</version>
         </plugin>
         <plugin>
           <groupId>org.eclipse.tycho.extras</groupId>