TestAccDataDnsTxtRecordSet_Basic fails in GitHub Actions

[kmoe]

Failure:

=== RUN   TestAccDataDnsTxtRecordSet_Basic
    data_dns_txt_record_set_test.go:13: Step 1/1 error: Error running pre-apply refresh: exit status 1
        2021/06/24 15:53:58 [DEBUG] Using modified User-Agent: Terraform/0.12.30 HashiCorp-terraform-exec/0.13.3
        
        Error: error looking up TXT records for "terraform.io": lookup terraform.io on 127.0.0.53:53: no such host
        
          on terraform_plugin_test.tf line 2, in data "dns_txt_record_set" "test":
           2: data "dns_txt_record_set" "test" {
        
        
--- FAIL: TestAccDataDnsTxtRecordSet_Basic (11.55s)

The nameserver is set to systemd's 127.0.0.53 - it's not clear whether this is related to the failure.

Note: This failure (which has now turned up in different environments) may in fact be something to do with the size of the TXT records on terraform.io. Recommend returning to this after #112 is implemented.

[github-actions]

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