Remove region variable passing in examples/basic/main.tf for the labels module

[catcharbind]

region variable has been deprecated in the latest version of the labels module but its still being passed causing error.

https://github.com/aws-ia/terraform-aws-label/blob/2eaa483458b6196db19003452eba434849d6a305/examples/basic/main.tf#L14C12-L14C22

[{
"resource": "/C:/Users/abc/Github/aws-ia-wsl/terraform-aws-rds-aurora/deploy/.terraform/modules/aurora_vpc_p.subnet_tags/examples/basic/main.tf",
"owner": "HashiCorpTerraform",
"severity": 8,
"message": "Unexpected attribute: An attribute named "region" is not expected here",
"source": "Terraform",
"startLineNumber": 14,
"startColumn": 3,
"endLineNumber": 14,
"endColumn": 22
}]