Bump to 4.3.0-SNAPSHOT

Author: jyemin

build.gradle

@@ -66,7 +66,7 @@ configure(coreProjects) {
 
     evaluationDependsOn(':util')
     group = 'org.mongodb'
-    version = '4.3.0-beta4'
+    version = '4.3.0-SNAPSHOT'
 
     repositories {
         mavenLocal()