fix(eks): helm private ecr in govcloud

[aceat64]

Using helm charts in a private ECR repo is not possible in govcloud regions, as the regex is too narrowly defined.

This change will properly match against all current AWS regions.

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• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 51ee6f0
• Result: SUCCEEDED
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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).