chore(rds): marked deprecated version (in Cluster)

[watany-dev]

The following corrections have been made

• Added comment on deprecated version
• Added version that was omitted
• Comment that was incorrect

---

All Submissions:

• Have you followed the guidelines in our Contributing guide?

Adding new Unconventional Dependencies:

• This PR adds new unconventional dependencies following the process described here

New Features

• Have you added the new feature to an integration test?
  • Did you use yarn integ to deploy the infrastructure and generate the snapshot (i.e. yarn integ without --dry-run)?

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[gitpod-io]

[TheRealAmazonKendra]

Suggested change

	* @deprecated Legacy Version no longer supported by Amazon RDS. Migrate to the available version.
	* @deprecated Version 5.7.12 is no longer supported by Amazon RDS.

Adding this suggestion in the one place but the pattern should be followed for each of these. Migrate to the available version. isn't a helpful message here so we might as well omit it if we don't want to specify what it is, given the potential upkeep of that info.

[watany-dev]

Thank you very much. I have generally reviewed all the messages with the policy you mentioned.

Pull request has been modified.

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[aws-cdk-automation]

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[mergify]

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).