chore(kinesisfirehose): ap-southeast-7 (#33777)

### Issue # (if applicable)

Closes #33730

### Description of changes
firehose support `ap-southeast-7`

### Description of how you validated changes
Integ test

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: phuhung273

packages/@aws-cdk-testing/framework-integ/test/aws-kinesisfirehose/test/integ.delivery-stream.js.snapshot/aws-cdk-firehose-delivery-stream.assets.json

@@ -252,6 +252,9 @@
    "ap-southeast-5": {
     "FirehoseCidrBlock": "43.216.58.0/27"
    },
+   "ap-southeast-7": {
+    "FirehoseCidrBlock": "43.208.112.96/27"
+   },
    "ca-central-1": {
     "FirehoseCidrBlock": "35.183.92.128/27"
    },