Bump release version to 4.1.2-SNAPSHOT

Author: jyemin

build.gradle

@@ -61,7 +61,7 @@ configure(coreProjects) {
 
     evaluationDependsOn(':util')
     group = 'org.mongodb'
-    version = '4.1.1'
+    version = '4.1.2-SNAPSHOT'
 
     repositories {
         mavenLocal()