Increment version to 3.4.0-SNAPSHOT

Signed-off-by: opensearch-ci-bot <[email protected]>

Author: opensearch-ci-bot

build.gradle

@@ -11,7 +11,7 @@ import com.github.jengelman.gradle.plugins.shadow.ShadowPlugin
 buildscript {
     ext {
         opensearch_group = "org.opensearch"
-        opensearch_version = System.getProperty("opensearch.version", "3.3.2-SNAPSHOT")
+        opensearch_version = System.getProperty("opensearch.version", "3.4.0-SNAPSHOT")
          buildVersionQualifier = System.getProperty("build.version_qualifier", "")
         isSnapshot = "true" == System.getProperty("build.snapshot", "true")
         version_tokens = opensearch_version.tokenize('-')