feat(lambda): add Ruby3.4 Lambda runtime support (#33832)

### Issue # (if applicable)

Closes #<issue number here>.

### Reason for this change

Ruby 3.4 support in Lambda is coming soon: https://docs.aws.amazon.com/lambda/latest/dg/lambda-runtimes.html#runtimes-future

### Description of changes

Add `ruby3.4` to the list of Lambda runtimes (`RUBY_3_4`) and add integration tests with their corresponding assets.

### Describe any new or updated permissions being added




### Description of how you validated changes

Added integ tests for Ruby 3.4. 



### 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)

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

Author: valerena