🐛 Need ARN values different in GOV regions.

[voor]

What this PR does / why we need it:
When secrets manager was added it did not account for the different arn values in AWS GOV regions. This updates that to bring it in-line with similar approaches.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Went ahead with the PR instead of opening an issue, let me know if you'd rather have an issue.

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[k8s-ci-robot]

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[ncdc]

/ok-to-test
/approve
/assign @randomvariable

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ncdc, voor

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[detiber]

/lgtm