feat: Add managed secrets option

[nimish]

Description

Adds the manage_master_password option to the redshift cluster

Motivation and Context

Reduces burden to manage secrets by having Redshift manage it directly.

Breaking Changes

No

How Has This Been Tested?

• I have updated at least one of the examples/* to demonstrate and validate my change(s)
• I have tested and validated these changes using one or more of the provided examples/* projects

• I have executed pre-commit run -a on my pull request

• I have used this in a production upgrade of a redshift cluster

[delaskoff]

Hi! Any chance to merge?

[bryantbiggs]

thank you!

[yurii-automat]

And a new release version? 😅

[bryantbiggs]

hmmm, not sure why the autorelease isn't detecting it as a new release. @antonbabenko what do we do for this scenario?

[antonbabenko]

This PR is included in version 5.1.0 🎉

[antonbabenko]

@bryantbiggs Looking at commits - https://github.com/terraform-aws-modules/terraform-aws-redshift/commits/master/

This PR was merged with the wrong commit title (commit 173b493). It should be "feat: ...", "fix: ...", so that Release GH Action does the work.

Looking in the previous commits, there was also 9c90d53 which was ignored by the Release GH Action.

[github-actions]

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