fix(): Source ARN Regex

[marco-belonio]

The regex

"^arn:(aws[a-zA-Z0-9-]*):([a-zA-Z0-9-]+):([a-z]{2}((-gov)|(-iso(b?)))?-[a-z]+-\d{1})?:(\d{12})?:(.+)$

has to use\d{1} instead of d{1} or all arns like eu-central-1 are rejected as invalid.

Description of change

Pull-Request Checklist

• Code is up-to-date with the main branch
• yarn lint passes with this change
• yarn test passes with this change
• This pull request links relevant issues as Fixes #0000
• There are new or updated unit tests validating the change
• Documentation has been updated to reflect this change
• The new commits follow conventions outlined in the conventional commit spec