Terraform plan hung while executing Google App Engine Resource

I am using terraform to import the state of existing GCP App Engine Resource so that the resource can be later managed with terraform

I imported using below command

  terraform import google_app_engine_standard_app_version.default <project>/default/20200711t113242

After that I executed terraform show to identify the state of existing resources and copy pasted the output of it to main.tf file and added the deployment section which was missing in the state information from terraform state
Now when I executed terraform show, it was showing error for missing deployment attribute . The app engine app was deployed using the sample GCP code from Github repo from the below URL
https://github.com/GoogleCloudPlatform/php-docs-samples.git” .

My overall main.tf looks like this

    resource "google_app_engine_standard_app_version" "default" {
delete_service_on_destroy = false
inbound_services          = []
instance_class            = "F1"
noop_on_destroy           = false
project                   = "<project-d>"
runtime                   = "php72"
service                   = "default"

 deployment {
files {
  name = "test"
  source_url = "https://github.com/GoogleCloudPlatform/php-docs-samples.git"


handlers {
    auth_fail_action = "AUTH_FAIL_ACTION_REDIRECT"
    login            = "LOGIN_OPTIONAL"
    security_level   = "SECURE_OPTIONAL"
    url_regex        = ".*"

    script {
        script_path = "auto"
timeouts {}


Now when I execute terraform plan , it fails with below error

   Refreshing Terraform state in-memory prior to plan...
   The refreshed state will be used to calculate this plan, but will not be
   persisted to local or remote state storage.`

google_app_engine_standard_app_version.default: Refreshing state...    

^CInterrupt received.
Please wait for Terraform to exit or data loss may occur. Gracefully shutting down... ^CTwo interrupts received. Exiting immediately. Note that data loss may have occurred. ^C^C^C^C^C^C^C^C^C^C^C^C^C^C Error: operation canceled Error: rpc error: code = Unavailable desc = transport is closing

  1. Please suggest how to resolve the issue ? It seems from the error the code repository is not reachable .
  2. Also I would like to change the label attribute from the versions section under App Engine . But I don’t see any argument from the below doc to modify the label argument . Also suggest here please.