fix(ec2): max iops value for io2 EBS volume is wrong

[go-to-k]

The max value of iops for io2 EBS volume is wrong. And I fixed the reference URL.

• 64000 -> 256000

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ec2-volume.html#cfn-ec2-volume-iops

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[aws-cdk-automation]

The pull request linter has failed. See the aws-cdk-automation comment below for failure reasons. If you believe this pull request should receive an exemption, please comment and provide a justification.

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[go-to-k]

Exemption Request: This PR just changes max value and the URLs.

[kaizencc]

Thanks @go-to-k

✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

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Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).