Update src/mongo_client.ts

Co-authored-by: Neal Beeken <neal.beeken@mongodb.com>

Author: baileympearson

src/mongo_client.ts

@@ -450,7 +450,7 @@ export class MongoClient extends TypedEventEmitter<MongoClientEvents> {
 
     return maybeCallback(async () => {
       try {
-        this.connectionLock = this.connectionLock ?? this._connect();
+        this.connectionLock ??= this._connect();
         await this.connectionLock;
         return this;
       } finally {