Bump versions after 8.3.3 release

Author: mark-vieira

.ci/bwcVersions

@@ -69,4 +69,5 @@ BWC_VERSION:
   - "8.3.1"
   - "8.3.2"
   - "8.3.3"
+  - "8.3.4"
   - "8.4.0"

.ci/snapshotBwcVersions

@@ -1,4 +1,4 @@
 BWC_VERSION:
   - "7.17.6"
-  - "8.3.3"
+  - "8.3.4"
   - "8.4.0"

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

@@ -117,6 +117,7 @@ public class Version implements Comparable<Version>, ToXContentFragment {
     public static final Version V_8_3_1 = new Version(8_03_01_99, org.apache.lucene.util.Version.LUCENE_9_2_0);
     public static final Version V_8_3_2 = new Version(8_03_02_99, org.apache.lucene.util.Version.LUCENE_9_2_0);
     public static final Version V_8_3_3 = new Version(8_03_03_99, org.apache.lucene.util.Version.LUCENE_9_2_0);
+    public static final Version V_8_3_4 = new Version(8_03_04_99, org.apache.lucene.util.Version.LUCENE_9_2_0);
     public static final Version V_8_4_0 = new Version(8_04_00_99, org.apache.lucene.util.Version.LUCENE_9_3_0);
     public static final Version CURRENT = V_8_4_0;