Use the google_tags_location_tag_binding Terraform resource to bind tags on KMS key rings

[arnodasilva]

The current version of the KMS Terraform module uses the `google_tags_tag_binding` resource to bind tags to KMS key rings. However, according to the Terraform documentation, this resource is only applicable to projects, folders, and organizations. For non-global resources, such as KMS key rings, the correct resource to use is `google_tags_location_tag_binding`.

Moreover, through multiple tests on a corporate Terraform project, tag bindings using google_tags_location_tag_binding have been successful, whereas attempts with google_tags_tag_binding have not worked.

--- **Checklist**

I applicable, I acknowledge that I have:

• Read the contributing guide
• Ran terraform fmt on all modified files
• Regenerated the relevant README.md files using tools/tfdoc.py
• Made sure all relevant tests pass

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[ludoo]

Thanks for spotting this!