LADV lambda to py3.12

Python runtime given throws an exception when creating the lambda function (`InvalidParameterValueException`). Update to the new runtime version.

Co-authored-by: Sean Shriver <[email protected]>

Author: brentroady

content/design-patterns/ex8streams/Step3.en.md

@@ -22,7 +22,7 @@ Now, run the following command to create the Lambda function.
 ```bash
 aws lambda create-function \
 --function-name ddbreplica_lambda --zip-file fileb://ddbreplica_lambda.zip \
---handler ddbreplica_lambda.lambda_handler --timeout 60 --runtime python3.10 \
+--handler ddbreplica_lambda.lambda_handler --timeout 60 --runtime python3.12 \
 --description "Sample lambda function for dynamodb streams" \
 --role $(cat ~/workshop/ddb-replication-role-arn.txt)
 ```