rag/knowledge-bases/features-examples/04-infrastructure fails to deploy (CDK)

following the instructions in
https://github.com/aws-samples/amazon-bedrock-samples/tree/main/rag/knowledge-bases/features-examples/04-infrastructure/e2e_rag_using_bedrock_kb_cdk

fails with:

```
1:40:05 PM | CREATE_FAILED | AWS::Lambda::LayerVersion | dependency_layer
Resource handler returned message: "Unzipped size must be smaller than 262144000 bytes (Service: AWSLambdaInternal; Status Code: 400; Error Code: Inv
alidParameterValueException; Request ID: 83d6e95c-833f-4775-be86-6543bbc81a22; Proxy: null)" (RequestToken: 3c23ecd4-afac-5ba3-cea5-2013caf8f807, Han
dlerErrorCode: GeneralServiceException)
1:40:05 PM | ROLLBACK_IN_PROGRESS | AWS::CloudFormation::Stack | OpenSearchServerlessStack
The following resource(s) failed to create: [Collection, OSSProviderRoleF97A4499, OSSIndexCreationProviderLogsE5FAF344, DataAccessPolicy, dependencyl
ayer10EAF76B, OSSLambdaRoleF799DD1D]. Rollback requested by user.
1:40:05 PM | ROLLBACK_IN_PROGRESS | AWS::CloudFormation::Stack | OpenSearchServerlessStack
The following resource(s) failed to create: [Collection, OSSProviderRoleF97A4499, OSSIndexCreationProviderLogsE5FAF344, DataAccessPolicy, dependencyl
ayer10EAF76B, OSSLambdaRoleF799DD1D]. Rollback requested by user.
```
I think the dependecy_layer.zip is too big.

Start in rag/knowledge-bases/features-examples/04-infrastructure/e2e_rag_using_bedrock_kb_cdk and follow its deployment instructions. Reproduce the CDK deployment and inspect dependency_layer.zip against the AWS Lambda unzipped-size limit; done means the example deploys without the dependency_layer CREATE_FAILED error.

Written by the indexing model from the issue text.