Update aws-redshift.mdx

[tonykau1]

Add requirement for permissions on pre-agg schema

Check List

• [ ] Tests has been run in packages where changes made if available
• [ ] Linter has been run for changed code
• [ ] Tests for the changes have been added if not covered yet
• [ ] Docs have been added / updated if required

Issue Reference this PR resolves

[For example #12]

Description of Changes Made (if issue reference is not provided)

[Description goes here]

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