Updates to AWS::RedshiftServerless::Namespace tags should not require replacement

### Name of the resource

Other

### Resource name

AWS::RedshiftServerless::Namespace

### Description

Modifying the tags on a Redshift Serverless Namespace causes the resource to be replaced. We can snapshot and restore the namespace to get around the issue, but it would be nice to be able to update these without extra steps.

### Other Details

_No response_

The issue names no files, tests, or entry points. Start by determining where AWS::RedshiftServerless::Namespace tag update and replacement behavior is implemented; done means tag changes update the namespace without requiring replacement.

Written by the indexing model from the issue text.