[567050] Cannot Setup Xtext with 2020-09 Eclipse installer

Try 1.3.0-SNAPSHOT version for eclipse-macsigner-plugin.

https://bugs.eclipse.org/bugs/show_bug.cgi?id=567050
diff --git a/products/org.eclipse.oomph.setup.installer.product/pom.xml b/products/org.eclipse.oomph.setup.installer.product/pom.xml
index 9fa601d..c7ad629 100644
--- a/products/org.eclipse.oomph.setup.installer.product/pom.xml
+++ b/products/org.eclipse.oomph.setup.installer.product/pom.xml
@@ -170,7 +170,7 @@
                   </fileNames>
                   <timeoutMillis>300000</timeoutMillis> <!-- 5 min -->
                   <entitlements>${project.basedir}/../../releng/org.eclipse.oomph.releng/hudson/installer.entitlements</entitlements>
-                  <signerUrl>http://172.30.206.146:8282/macosx-signing-service/1.0.1-SNAPSHOT</signerUrl>
+                  <signerUrl>http://172.30.206.146:8282/macosx-signing-service/1.3.0-SNAPSHOT</signerUrl>
                 </configuration>
               </execution>
             </executions>