MongoDB Atlas not connecting with my golang App

I'm new to golang and MongoDB i've been following the official blog of mongoDb for getting started with mongo-db driver for go, and i'm not able to connect to my mongodb for some reason here is the code ,the error is "context deadline exceeded", thnx in advance

package main

import (
    "context"
    "fmt"
    "log"
    "time"

    "go.mongodb.org/mongo-driver/bson"
    "go.mongodb.org/mongo-driver/mongo"
    "go.mongodb.org/mongo-driver/mongo/options"
    // "go.mongodb.org/mongo-driver/mongo/readpref"
)

func main() {
    client, err := mongo.NewClient(options.Client().ApplyURI("mongodb+srv://chandru:<Heregoesmypassword>@cluster0-9jkaf.mongodb.net/test?retryWrites=true&w=majority"))
    if err != nil {
        log.Fatal(err)
    }
    ctx, _ := context.WithTimeout(context.Background(), 20*time.Second)
    err = client.Connect(ctx)
    if err != nil {
        log.Fatal(err)
    }
    defer client.Disconnect(ctx)
    databases, err := client.ListDatabaseNames(ctx, bson.M{})
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println(databases)
}