update class version

Author: ccaillol

DataFormats/L1Trigger/src/classes_def.xml

@@ -280,8 +280,8 @@
 
   <class name="edm::Ptr<l1t::L1Candidate>"/>
 
-  <class name="l1t::Vertex" ClassVersion="3">
-    <version ClassVersion="3" checksum="514139083"/>
+  <class name="l1t::Vertex" ClassVersion="4">
+    <version ClassVersion="4" checksum="3366446278"/>
   </class>
   <class name="std::vector<l1t::Vertex>"/>