Update to Oomph-provided Jetty 10.0.15

Change-Id: I4ed9f10c88c6d821e79a76b1a68bd524c255ab9c
diff --git a/wtp-parent/pom.xml b/wtp-parent/pom.xml
index afcd5fa..23e0cd5 100644
--- a/wtp-parent/pom.xml
+++ b/wtp-parent/pom.xml
@@ -58,7 +58,7 @@
     <!-- we don't use our own any more 

          <jetty-repo.url>https://download.eclipse.org/webtools/jetty/10.0.14/repository/</jetty-repo.url> 

     -->

-    <jetty-repo.url>https://download.eclipse.org/oomph/jetty/release/10.0.14/</jetty-repo.url>

+    <jetty-repo.url>https://download.eclipse.org/oomph/jetty/release/10.0.15/</jetty-repo.url>

     <graphiti-repo.url>https://download.eclipse.org/graphiti/updates/0.19.1/</graphiti-repo.url>

     <dtp-repo.url>https://download.eclipse.org/datatools/updates/1.14.300-SNAPSHOT/repository/</dtp-repo.url>