[SVLS-8366] feat: Add ap-east-2 and ap-southeast-6 to release config (#1001)

## Overview

Add two new AWS regions to the release script, so the next release will
cover them:
1. ap-east-2: Taipei, 2025/06/05:
https://aws.amazon.com/blogs/aws/now-open-aws-asia-pacific-taipei-region/
2. ap-southeast-6: New Zealand, 2025/09/01
https://aws.amazon.com/blogs/aws/now-open-aws-asia-pacific-new-zealand-region/

I guess updating `.gitlab/datasources/regions.yaml` should work. Let me
know if I should do something else.

## Testing
Test on the next release.

Author: lym953

.gitlab/datasources/regions.yaml

@@ -5,13 +5,15 @@ regions:
   - code: "us-west-2"
   - code: "af-south-1"
   - code: "ap-east-1"
+  - code: "ap-east-2"
   - code: "ap-south-1"
   - code: "ap-south-2"
   - code: "ap-southeast-1"
   - code: "ap-southeast-2"
   - code: "ap-southeast-3"
   - code: "ap-southeast-4"
   - code: "ap-southeast-5"
+  - code: "ap-southeast-6"
   - code: "ap-southeast-7"
   - code: "ap-northeast-1"
   - code: "ap-northeast-2"