vault lambda extension demo can fail if there's no default VPC

[takeda]

aws_kms_alias.vault: Creating...
aws_kms_alias.vault: Creation complete after 0s [id=alias/vault-lambda-extension-demo-vault-kms-unseal-key]
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│ Error: error creating Security Group (vault-lambda-extension-demo-vault-server-sg): VPCIdNotSpecified: No default VPC for this user
│ 	status code: 400, request id: ab199ea7-a362-4926-8afc-a2435fd08faa
│
│   with aws_security_group.vault-server,
│   on security-groups.tf line 1, in resource "aws_security_group" "vault-server":
│    1: resource "aws_security_group" "vault-server" {
│
╵
╷
│ Error: error creating Security Group (vault-lambda-extension-demo-rds-sg): VPCIdNotSpecified: No default VPC for this user
│ 	status code: 400, request id: 65c1f91d-d3a4-40fd-b80e-17bea922b53e
│
│   with aws_security_group.rds,
│   on security-groups.tf line 49, in resource "aws_security_group" "rds":
│   49: resource "aws_security_group" "rds" {
│
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