Make Version.java aware of 6.x Lucene upgrade

Relates to #37913

Author: ywelsch

server/src/main/java/org/elasticsearch/Version.java

@@ -121,7 +121,7 @@ public class Version implements Comparable<Version>, ToXContentFragment {
     public static final int V_6_6_0_ID = 6060099;
     public static final Version V_6_6_0 = new Version(V_6_6_0_ID, org.apache.lucene.util.Version.LUCENE_7_6_0);
     public static final int V_6_7_0_ID = 6070099;
-    public static final Version V_6_7_0 = new Version(V_6_7_0_ID, org.apache.lucene.util.Version.LUCENE_7_6_0);
+    public static final Version V_6_7_0 = new Version(V_6_7_0_ID, org.apache.lucene.util.Version.LUCENE_7_7_0);
     public static final int V_7_0_0_ID = 7000099;
     public static final Version V_7_0_0 = new Version(V_7_0_0_ID, org.apache.lucene.util.Version.LUCENE_8_0_0);
     public static final Version CURRENT = V_7_0_0;