single-account-ecs module no longer lists AWS provider as required

[if-jeremy]

It would appear that with commit a20400e in May, the AWS provider is no longer listed as required in examples/single-account-ecs/versions.tf. While I'm sure for many this will still work (because they probably only have one AWS provider), we actually deploy Sysdig into two accounts, which means we have 2 AWS providers. Without the AWS provider requirement listed, specifying the correct provider for the module results in a warning from "terraform plan":

Warning: Provider aws is undefined

on sysdig-secure.tf line 18, in module "secure-for-cloud-backups":
18: aws = aws.account2

Module module.secure-for-cloud-account2 does not declare a provider named aws.
If you wish to specify a provider configuration for the module, add an entry
for aws in the required_providers block within the module.

[wideawakening]

hey @if-jeremy,

we removed those providers because tf linter was warning us that aws resources were not used in the example themselves (in our case only in child modules).

i thought that maybe your error could be bypassed defining the required_providers in the caller code, but seems like its required in the children module indeed - will restore them in a PR and mark it for linter to ignore it.

thanks for the call!