fix(eks): undefined constructor in custom resource (#26782)

When we [upgraded the proxy-agent v6](#26722) we did not update how we were importing from the package. Where [in 5.0 commonjs exports were used](https://github.com/TooTallNate/node-proxy-agent/blob/5.0.0/index.js#L25) , in [6.0 a named esm export is used](https://github.com/TooTallNate/proxy-agents/blob/proxy-agent%406.1.0/packages/proxy-agent/src/index.ts#L71).

Updated to use a named import statement instead of a default require. Typescript also confirms the old import was an error now since we use `import` instead of `require`.

Fixes: #26771

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: MrArnoldPalmer

packages/@aws-cdk-testing/framework-integ/test/aws-eks/test/integ.eks-cluster.js.snapshot/asset.3f579d6c1ab146cac713730c96809dd4a9c5d9750440fb835ab20fd6925e528c.zip

@@ -5,15 +5,14 @@ import { EKS } from '@aws-sdk/client-eks';
 import { fromTemporaryCredentials } from '@aws-sdk/credential-providers';
 // eslint-disable-next-line import/no-extraneous-dependencies
 import { NodeHttpHandler } from '@aws-sdk/node-http-handler';
+// eslint-disable-next-line import/no-extraneous-dependencies
+import { ProxyAgent } from 'proxy-agent';
 import { ClusterResourceHandler } from './cluster';
 import { EksClient } from './common';
 import * as consts from './consts';
 import { FargateProfileResourceHandler } from './fargate';
 import { IsCompleteResponse } from '../../../custom-resources/lib/provider-framework/types';
 
-// eslint-disable-next-line @typescript-eslint/no-require-imports, import/no-extraneous-dependencies
-const ProxyAgent = require('proxy-agent');
-
 const proxyAgent = new ProxyAgent();
 const awsConfig = {
   logger: console,