Restore get_database_version functionality

Author: aclark4life

django_mongodb_backend/base.py

@@ -286,6 +286,4 @@ def validate_no_broken_transaction(self):
 
     def get_database_version(self):
         """Return a tuple of the database's version."""
-        return (8, 1, 1)
-        # TODO: provide an unencrypted connection for this method.
-        # return tuple(self.connection.server_info()["versionArray"])
+        return tuple(self.connection.server_info()["versionArray"])