fix node16 builds

Author: baileympearson

test/csfle-kms-providers.js

@@ -25,10 +25,8 @@ const { EJSON } = require('bson');
 //     }
 // }
 
-const csfleKMSProviders = EJSON.parse(process.env.CSFLE_KMS_PROVIDERS2 ?? '{}');
-
 function getCSFLEKMSProviders() {
-  return structuredClone(csfleKMSProviders);
+  return JSON.parse(process.env.CSFLE_KMS_PROVIDERS2 ?? '{}')
 }
 
 const keys = [