Remove v7.10.3 after v7.11.0 release

Author: pugnascotia

.ci/bwcVersions

@@ -73,5 +73,4 @@ BWC_VERSION:
   - "7.10.0"
   - "7.10.1"
   - "7.10.2"
-  - "7.10.3"
   - "7.11.0"

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

@@ -138,7 +138,6 @@ public class Version implements Comparable<Version>, ToXContentFragment {
     public static final Version V_7_10_0 = new Version(7100099, org.apache.lucene.util.Version.LUCENE_8_7_0);
     public static final Version V_7_10_1 = new Version(7100199, org.apache.lucene.util.Version.LUCENE_8_7_0);
     public static final Version V_7_10_2 = new Version(7100299, org.apache.lucene.util.Version.LUCENE_8_7_0);
-    public static final Version V_7_10_3 = new Version(7100399, org.apache.lucene.util.Version.LUCENE_8_7_0);
     public static final Version V_7_11_0 = new Version(7110099, org.apache.lucene.util.Version.LUCENE_8_7_0);
     public static final Version V_7_11_1 = new Version(7110199, org.apache.lucene.util.Version.LUCENE_8_7_0);
     public static final Version CURRENT = V_7_11_1;