Fix outdated coredns version (#1447)

<!--Thanks for your contribution. See [CONTRIBUTING](CONTRIBUTING.md)
    for Pulumi's contribution guidelines.

    Help us merge your changes more quickly by adding more details such
    as labels, milestones, and reviewers.-->

### Proposed changes

<!--Give us a brief description of what you've done and what it solves.
-->

Backport 3.x changes that make examples compute the latest coredns addon
version instead of using an outdated version and failing.

### Related issues (optional)

<!--Refer to related PRs or issues: #1234, or 'Fixes #1234' or 'Closes
#1234'.
Or link to full URLs to issues or pull requests in other GitHub
repositories. -->

Fixes #1444
Fixes #1437

examples/cluster-py/__main__.py

@@ -71,11 +71,15 @@
 ###     EKS Addons     ###
 ##########################
 
+coredns_version = aws.eks.get_addon_version_output(addon_name="coredns",
+    kubernetes_version=cluster3.eks_cluster.version,
+    most_recent=True)
+
 coredns = eks.Addon(
     f"{project_name}-cluster3-coredns",
     cluster=cluster3,
     addon_name="coredns",
-    addon_version="v1.11.1-eksbuild.9",
+    addon_version=coredns_version.version,
     resolve_conflicts_on_update="PRESERVE",
     configuration_values={
     "replicaCount": 4,

examples/cluster/index.ts

@@ -1,4 +1,5 @@
 import * as pulumi from "@pulumi/pulumi";
+import * as aws from "@pulumi/aws";
 import * as awsx from "@pulumi/awsx";
 import * as eks from "@pulumi/eks";
 
@@ -62,11 +63,17 @@ const cluster4 = new eks.Cluster(`${projectName}-4`, {
 ///     EKS Addons     ///
 //////////////////////////
 
+const corednsVersion = aws.eks.getAddonVersionOutput({
+  addonName: "coredns",
+  kubernetesVersion: cluster3.eksCluster.version,
+  mostRecent: true,
+});
+
 // Test that we can create a coredns addon within cluster3.
 const coredns = new eks.Addon("coredns", {
   cluster: cluster3,
   addonName: "coredns",
-  addonVersion: "v1.11.1-eksbuild.9",
+  addonVersion: corednsVersion.version,
   resolveConflictsOnUpdate: "PRESERVE",
   configurationValues: {
     replicaCount: 4,

examples/cluster/package.json

@@ -7,6 +7,7 @@
     "dependencies": {
         "@pulumi/pulumi": "^3.0.0",
         "@pulumi/awsx": "^2.0.2",
+        "@pulumi/aws": "^6.56.0",
         "@pulumi/eks": "latest"
     },
     "scripts": {