Bump to 4.3.0-beta2

Author: jyemin

build.gradle

@@ -66,7 +66,7 @@ configure(coreProjects) {
 
     evaluationDependsOn(':util')
     group = 'org.mongodb'
-    version = '4.3.0-SNAPSHOT'
+    version = '4.3.0-beta2'
 
     repositories {
         mavenLocal()