feat(region-info): update Metadata regions (#31044)

Update the list of regions where the CDK deploys the `AWS::CDK::Metadata` resource.

Author: aws-cdk-automation

packages/aws-cdk-lib/region-info/build-tools/metadata.ts

@@ -12,6 +12,7 @@ export const AWS_CDK_METADATA = new Set([
   'ap-east-1',
   'ap-northeast-1',
   'ap-northeast-2',
+  'ap-northeast-3',
   'ap-south-1',
   'ap-southeast-1',
   'ap-southeast-2',