Allow terraform-provider-aws v3.0+ plugin

* Typhoon AWS is compatible with terraform-provider-aws v3.x releases
* Continue to allow v2.23+, no v3.x specific features are used
* Set required provider versions in the worker module, since
it can be used independently

Related:

* https://github.com/terraform-providers/terraform-provider-aws/releases/tag/v3.0.0

CHANGES.md

@@ -11,6 +11,12 @@ Notable changes between versions.
   * Update CNI plugins and fix CVEs with Flannel (non-default)
   * Transition to a poseidon maintained container image
 
+### AWS
+
+* Allow `terraform-provider-aws` v3.0+
+  * Recommend updating `terraform-provider-aws` to v3.0+
+  * Continue to allow v2.23+, no v3.x specific features are used
+
 ### Fedora CoreOS
 
 * Fix support for Flannel with Fedora CoreOS ([#795](https://github.com/poseidon/typhoon/pull/795))

aws/container-linux/kubernetes/versions.tf

@@ -3,7 +3,7 @@
 terraform {
   required_version = "~> 0.12.6"
   required_providers {
-    aws      = "~> 2.23"
+    aws      = ">= 2.23, <= 4.0"
     ct       = "~> 0.4"
     template = "~> 2.1"
     null     = "~> 2.1"

aws/container-linux/kubernetes/workers/versions.tf

@@ -1,4 +1,9 @@
 
 terraform {
   required_version = ">= 0.12"
+  required_providers {
+    aws      = ">= 2.23, <= 4.0"
+    ct       = "~> 0.4"
+    template = "~> 2.1"
+  }
 }

aws/fedora-coreos/kubernetes/versions.tf

@@ -3,7 +3,7 @@
 terraform {
   required_version = "~> 0.12.6"
   required_providers {
-    aws      = "~> 2.23"
+    aws      = ">= 2.23, <= 4.0"
     ct       = "~> 0.4"
     template = "~> 2.1"
     null     = "~> 2.1"

aws/fedora-coreos/kubernetes/workers/versions.tf

@@ -1,4 +1,9 @@
 
 terraform {
   required_version = ">= 0.12"
+  required_providers {
+    aws      = ">= 2.23, <= 4.0"
+    ct       = "~> 0.4"
+    template = "~> 2.1"
+  }
 }