aws-synthetics: missing supported python selenium runtimes

### Describe the feature

Missing the following Runtimes

- syn-python-selenium-11.0
- Python 3.12
- Selenium 4.32.0
- Chromium version 147.0.7727.57
- Added syn-python-selenium-10.0
- Python 3.11
- Selenium 4.32.0
- Chromium version 145.0.7632.77
- Added syn-python-selenium-9.0
- Python 3.11
- Selenium 4.32.0
- Chromium version 143.0.7499.169
- Added syn-python-selenium-8.0
- Python 3.11
- Selenium 4.32.0
- Chromium version 142.0.7444.175

### Use Case

Allows users of Canary Synthetics to leverage newer Synthetic Runtime versions

### Proposed Solution

Add the additional runtimes to runtimes.ts following existing pattern

### Other Information

_No response_

### Acknowledgements

- [x] I may be able to implement this feature request
- [ ] This feature might incur a breaking change

### AWS CDK Library version (aws-cdk-lib)

2.256.1

### AWS CDK CLI version

2.1123.0

### Environment details (OS name and version, etc.)

macOS Sequoia 15.7.7

Open runtimes.ts and follow the existing runtime-entry pattern for the listed Python Selenium versions. Confirm all four requested runtimes are represented with their stated Python, Selenium, and Chromium versions; done means users can select syn-python-selenium-8.0 through syn-python-selenium-11.0.

Written by the indexing model from the issue text.