[releng] Use newer version of jar signer.

releng/org.eclipse.emf.parent/pom.xml

diff --git a/releng/org.eclipse.emf.parent/pom.xml b/releng/org.eclipse.emf.parent/pom.xml
index a02eced..cb93624 100644
--- a/releng/org.eclipse.emf.parent/pom.xml
+++ b/releng/org.eclipse.emf.parent/pom.xml
@@ -12,7 +12,7 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <tycho.scmUrl>scm:git:https://git.eclipse.org/r/p/emf/org.eclipse.emf.git</tycho.scmUrl>
     <tycho-version>2.2.0</tycho-version>
-    <jarsigner-version>1.1.7</jarsigner-version>
+    <jarsigner-version>1.3.1</jarsigner-version>
     <javaVersion>11</javaVersion>
     <os-jvm-flags/>
   </properties>