attach_network_policy = true does not work for govcloud

[kanchen]

attach_network_policy = true does not work for govcloud as policy ARN is hard coded in
https://github.com/terraform-aws-modules/terraform-aws-lambda/blob/master/iam.tf

[antonbabenko]

Good point! Fixed in #201.

v2.18.0 has been just released.

[github-actions]

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