SLING-10570 Update to Sling (Bundle) Parent 44

add missing project.build.outputTimestamp
diff --git a/pom.xml b/pom.xml
index 1b3d1ec..6558c22 100644
--- a/pom.xml
+++ b/pom.xml
@@ -35,6 +35,7 @@
   <description>Launchpad Integration Tests for Apache Sling with Oak Tar on Karaf</description>
 
   <properties>
+    <project.build.outputTimestamp>1970-01-01T00:00:00Z</project.build.outputTimestamp>
     <org.ops4j.pax.exam.version>4.13.3</org.ops4j.pax.exam.version>
   </properties>