aws-s3-deployment: BucketDeployment creates Lambda function with unsupported runtime

### Describe the bug

When using the BucketDeployment a lambda will be created using an old runtime version of python. This causes the AwsSolutions-L1 to complain stating that a non-container Lambda function is not configured to use the latest runtime version.

This seems to be a repeat of this issue: https://github.com/aws/aws-cdk/issues/21470

### Regression Issue

- [ ] Select this option if this issue appears to be a regression.

### Last Known Working CDK Library Version

_No response_

### Expected Behavior

The BucketDeployment should either let me control which runtime it uses, or default to the latest.

### Current Behavior

BucketDeployment is using an old runtime and this causes CDK deployments to fail.

### Reproduction Steps

aws-cdk: 2.1013.0
aws-cdk-lib: 2.194.0

Attempt to create a BucketDeployment and an error will be thrown stating:

"AwsSolutions-L1: The non-container Lambda function is not configured to use the latest runtime version. Use the latest available runtime for the targeted language to avoid technical debt. Runtimes specific to a language or framework version are deprecated when the version reaches end of life. This rule only applies to non-container Lambda functions."

### Possible Solution

Let me control the runtime, or update the runtime to use the latest that the CDK cli is expecting.

### Additional Information/Context

_No response_

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

2.194.0

### AWS CDK CLI version

2.1013.0

### Node.js Version

22

### OS

macOS Sequoia 15.4.1

### Language

TypeScript

### Language Version

_No response_

### Other information

_No response_

Start at the BucketDeployment entry point and follow where its Lambda runtime is selected. Compare that path with the reported AwsSolutions-L1 expectation and verify the behavior using a minimal BucketDeployment reproduction; done means the generated function uses a supported runtime or exposes the requested runtime control without triggering the finding.

Written by the indexing model from the issue text.