fix(rds): changing engine versions would fail to update on DBInstances that were part of a DBCluster

[joshlartz]

Engine version should not be set on instances that are part of a cluster. The cluster is responsible for this setting and throws an API error when an update is attempted on them.

closes #22180

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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).

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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).

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