Update mongodb driver version to 3.12.8

Update mongodb driver version to 3.12.8
diff --git a/pom.xml b/pom.xml
index c7221d1..590dcfc 100755
--- a/pom.xml
+++ b/pom.xml
@@ -889,7 +889,7 @@
     <couchdb.version>1.5.0</couchdb.version>
 
     <!-- MongoDB Dependencies -->
-    <mongo.driver.version>3.12.4</mongo.driver.version>
+    <mongo.driver.version>3.12.8</mongo.driver.version>
 
     <!-- HiveStore Dependencies -->
     <metamodel.version>5.3.0</metamodel.version>