Move to new jar signing service

Versions older than 1.3.x of the jarsigner plugin were using the
decommissioned server build.eclipse.org instead of the new URL
https://cbi.eclipse.org/jarsigner/sign for signing the bundles and
artifacts.

Using a version >=1.3.0 solves that by using the new URL.

Change-Id: Ie23abebb85e9b903ef0efcee732502fa0d7000c0
Signed-off-by: Markus Knauer <mknauer@eclipsesource.com>
diff --git a/releng/org.eclipse.rap.tools.build/pom.xml b/releng/org.eclipse.rap.tools.build/pom.xml
index f90610b..cf0e864 100644
--- a/releng/org.eclipse.rap.tools.build/pom.xml
+++ b/releng/org.eclipse.rap.tools.build/pom.xml
@@ -23,7 +23,7 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <maven.build.timestamp.format>yyyyMMdd-HHmm</maven.build.timestamp.format>
     <tycho-version>2.1.0</tycho-version>
-    <signing-plugin-version>1.1.7</signing-plugin-version>
+    <signing-plugin-version>1.3.2</signing-plugin-version>
     <tycho.scmUrl>scm:git:git://git.eclipse.org/gitroot/rap/org.eclipse.rap.tools.git</tycho.scmUrl>
     <!-- disabled due to bug 393977
     <baseline-repository>http://download.eclipse.org/rt/rap/nightly/tooling/</baseline-repository>