Add lucene 10.3.1 backport index version used in ES 9.2 (#136188)

The backport version was added by #136187

Author: thecoop

server/src/main/java/org/elasticsearch/index/IndexVersions.java

@@ -186,6 +186,7 @@ private static Version parseUnchecked(String version) {
     public static final IndexVersion TSID_CREATED_DURING_ROUTING = def(9_037_0_00, Version.LUCENE_10_2_2);
     public static final IndexVersion UPGRADE_TO_LUCENE_10_3_0 = def(9_038_0_00, Version.LUCENE_10_3_0);
     public static final IndexVersion IGNORED_SOURCE_COALESCED_ENTRIES = def(9_039_0_00, Version.LUCENE_10_3_0);
+    public static final IndexVersion BACKPORT_UPGRADE_TO_LUCENE_10_3_1 = def(9_039_0_01, Version.LUCENE_10_3_1);
     public static final IndexVersion KEYWORD_MULTI_FIELDS_NOT_STORED_WHEN_IGNORED = def(9_040_0_00, Version.LUCENE_10_3_0);
     public static final IndexVersion UPGRADE_TO_LUCENE_10_3_1 = def(9_041_0_00, Version.LUCENE_10_3_1);